{"title":"Hardware Installation Tools \/ Helpers","description":null,"products":[{"product_id":"ezo-hsa750-hipshot-a-style-bridge-layout-drill-guide","title":"EZO HSA750 Hipshot A-Style Bridge Layout \u0026 Drill Guide","description":"\u003ch2\u003eEZO HSA750 Bridge Layout \u0026amp; Drill Guide\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003ePrecision bridge placement, alignment, and drilling for the Hipshot A-Style .750\" 4-string bass bridge.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eInstalling a bridge is one of the most critical layout operations in an instrument build. Centerline alignment, scale-length placement, intonation range, mounting holes, and string-through locations all need to agree before the first permanent hole is drilled.\u003c\/p\u003e\n\u003cp\u003eThe \u003cstrong\u003eEZO HSA750 Bridge Layout \u0026amp; Drill Guide\u003c\/strong\u003e brings those critical references together into one purpose-built tool.\u003c\/p\u003e\n\u003cp\u003eDesigned specifically for the \u003cstrong\u003e4-string Hipshot A-Style Bass Bridge with .750\" string spacing\u003c\/strong\u003e, the HSA750 assists with both \u003cstrong\u003eX and Y bridge positioning\u003c\/strong\u003e, provides a dedicated \u003cstrong\u003eintonation midpoint reference\u003c\/strong\u003e, and accurately locates the bridge mounting and string-through holes.\u003c\/p\u003e\n\u003cp\u003eInstead of independently measuring every feature of the bridge, the HSA750 allows you to establish the important geometry directly on the instrument.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eEstablish the scale. Align the centerline. Position the bridge. Drill with confidence.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eMore Than a Drill Template\u003c\/h2\u003e\n\u003cp\u003eA bridge isn't correctly positioned just because its mounting holes are in the right place.\u003c\/p\u003e\n\u003cp\u003eIts position must agree with the instrument's:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eScale length\u003c\/li\u003e\n\u003cli\u003eNeck centerline\u003c\/li\u003e\n\u003cli\u003eString path\u003c\/li\u003e\n\u003cli\u003eSaddle position\u003c\/li\u003e\n\u003cli\u003eAvailable intonation adjustment\u003c\/li\u003e\n\u003cli\u003eMounting-hole pattern\u003c\/li\u003e\n\u003cli\u003eString-through locations\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe HSA750 was designed around those relationships.\u003c\/p\u003e\n\u003cp\u003eRather than simply reproducing the mounting-hole pattern of the bridge, the guide provides physical references that help establish \u003cstrong\u003ewhere the bridge belongs on the instrument before those holes are ever drilled.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eTwo Axes. One Bridge Position.\u003c\/h2\u003e\n\u003cp\u003eThe HSA750 incorporates two primary layout references that work together to establish bridge position.\u003c\/p\u003e\n\u003ch2\u003eLongitudinal Centerline — X-Axis Alignment\u003c\/h2\u003e\n\u003cp\u003eThe centerline running lengthwise through the HSA750 provides a direct reference for aligning the bridge with the instrument.\u003c\/p\u003e\n\u003cp\u003eThis allows the guide to be aligned with your established neck and instrument centerline, helping ensure that the bridge follows the intended string path rather than simply referencing the outside shape of the body.\u003c\/p\u003e\n\u003cp\u003eThis is especially valuable during scratch builds, where there may be no existing bridge holes or factory references to work from.\u003c\/p\u003e\n\u003ch2\u003eHorizontal Reference Line — Intonation Midpoint\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003ehorizontal reference line on the HSA750 represents the midpoint of the Hipshot A-Style bridge's available intonation adjustment range.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis is an important distinction.\u003c\/p\u003e\n\u003cp\u003eThe line does \u003cstrong\u003enot\u003c\/strong\u003e simply represent an arbitrary edge or dimension of the bridge. It references the center of the saddle's available fore-and-aft adjustment.\u003c\/p\u003e\n\u003cp\u003eThat gives the builder a meaningful reference when establishing bridge position relative to the instrument's scale length.\u003c\/p\u003e\n\u003cp\u003eInstead of measuring from the front or rear edge of the bridge—dimensions that have little direct relationship to the vibrating length of the string—the HSA750 lets you position the bridge according to the \u003cstrong\u003ecenter of its usable intonation range.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis provides a repeatable starting point while retaining saddle adjustment in both directions for final setup and compensation.\u003c\/p\u003e\n\u003ch2\u003eDesigned Around Intonation Adjustment\u003c\/h2\u003e\n\u003cp\u003eProper intonation requires the bridge saddles to move.\u003c\/p\u003e\n\u003cp\u003eThat's why simply placing a saddle at the nominal scale length without considering its available adjustment range isn't an ideal way to establish the position of the entire bridge.\u003c\/p\u003e\n\u003cp\u003eThe HSA750 makes that adjustment range visible during layout.\u003c\/p\u003e\n\u003cp\u003eBy referencing the \u003cstrong\u003emidpoint of the bridge's intonation travel\u003c\/strong\u003e, the builder can deliberately position the bridge while preserving usable adjustment for final setup.\u003c\/p\u003e\n\u003cp\u003eThe horizontal intonation reference and longitudinal centerline work together:\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eVertical\/longitudinal centerline:\u003c\/strong\u003e\u003cbr\u003eControls neck, bridge, and string-path alignment.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHorizontal reference line:\u003c\/strong\u003e\u003cbr\u003eIdentifies the midpoint of the bridge's intonation adjustment range.\u003c\/p\u003e\n\u003cp\u003eTogether, these references establish the bridge position along both axes before any permanent drilling operation begins.\u003c\/p\u003e\n\u003ch2\u003ePurpose-Built for the Hipshot A-Style .750\"\u003c\/h2\u003e\n\u003cp\u003eThe HSA750 isn't a universal bridge template.\u003c\/p\u003e\n\u003cp\u003eIt was engineered specifically around the geometry of the \u003cstrong\u003eHipshot A-Style 4-string bass bridge with .750\" string spacing.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe bridge centerline, intonation midpoint, mounting-hole pattern, and string-through locations are incorporated into one coordinated layout system.\u003c\/p\u003e\n\u003cp\u003eThat means you don't need to independently establish each of those measurements or repeatedly reposition the actual bridge while marking the instrument.\u003c\/p\u003e\n\u003cp\u003ePlace the guide.\u003c\/p\u003e\n\u003cp\u003eEstablish your references.\u003c\/p\u003e\n\u003cp\u003eVerify your layout.\u003c\/p\u003e\n\u003cp\u003eThen transfer the geometry to the body.\u003c\/p\u003e\n\u003ch2\u003eMounting Hole Layout\u003c\/h2\u003e\n\u003cp\u003eOnce the HSA750 is properly positioned, the bridge mounting-hole locations can be transferred directly to the instrument.\u003c\/p\u003e\n\u003cp\u003eThis eliminates the need to individually measure the mounting-hole spacing or use the actual bridge as a drilling template.\u003c\/p\u003e\n\u003cp\u003eIt also means your finished bridge can stay safely on the bench while drilling, marking, and other potentially destructive operations take place around the instrument.\u003c\/p\u003e\n\u003cp\u003eBecause the mounting locations are referenced to the same centerline and intonation geometry used to position the guide, the entire operation remains part of one consistent layout.\u003c\/p\u003e\n\u003ch2\u003eString-Through Layout\u003c\/h2\u003e\n\u003cp\u003eBuilding a string-through-body bass?\u003c\/p\u003e\n\u003cp\u003eThe HSA750 also incorporates the corresponding \u003cstrong\u003estring-through locations\u003c\/strong\u003e for the Hipshot A-Style bridge.\u003c\/p\u003e\n\u003cp\u003eBecause these locations share the same geometry as the bridge mounting pattern, centerline, and intonation reference, they remain aligned with the rest of the installation.\u003c\/p\u003e\n\u003cp\u003eThis gives you a single reference tool for establishing the bridge and transferring both mounting and string-through locations.\u003c\/p\u003e\n\u003ch2\u003eBuilt for Scratch Builders\u003c\/h2\u003e\n\u003cp\u003eThe HSA750 is particularly useful when building an instrument from scratch.\u003c\/p\u003e\n\u003cp\u003eThere are no factory holes.\u003c\/p\u003e\n\u003cp\u003eThere is no existing bridge position.\u003c\/p\u003e\n\u003cp\u003eThere may not even be a finished body perimeter available as a reliable reference.\u003c\/p\u003e\n\u003cp\u003eInstead, the instrument is built around established geometric relationships: the neck, scale length, centerline, string path, and hardware.\u003c\/p\u003e\n\u003cp\u003eThat's exactly where the HSA750 shines.\u003c\/p\u003e\n\u003cp\u003eIt provides a physical bridge-layout reference that works from the geometry of the instrument rather than requiring an existing instrument to copy.\u003c\/p\u003e\n\u003ch2\u003eDesigned for the Shop\u003c\/h2\u003e\n\u003cp\u003eThe HSA750 was developed as an actual working luthier tool—not simply a dimensional model of a bridge.\u003c\/p\u003e\n\u003cp\u003eIts larger footprint provides useful reference surfaces for positioning and alignment while making the guide easy to handle and secure during layout.\u003c\/p\u003e\n\u003cp\u003eIntegrated reference lines communicate the important geometry directly on the tool, helping make the installation process easier to understand at the bench.\u003c\/p\u003e\n\u003cp\u003eIt is reusable, purpose-built, and designed to eliminate repetitive layout work.\u003c\/p\u003e\n\u003cp\u003eIt's the kind of tool we wanted on our own bench.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eSo we made it.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eFeatures\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eDesigned specifically for the \u003cstrong\u003eHipshot A-Style 4-string bass bridge\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eDesigned for \u003cstrong\u003e.750\" string spacing\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eAssists with X and Y bridge positioning\u003c\/li\u003e\n\u003cli\u003eIntegrated longitudinal bridge centerline\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eHorizontal reference line indicates the midpoint of the bridge's intonation adjustment range\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eHelps establish bridge position relative to scale length\u003c\/li\u003e\n\u003cli\u003ePreserves usable saddle adjustment for final intonation\u003c\/li\u003e\n\u003cli\u003eIntegrated bridge mounting-hole locations\u003c\/li\u003e\n\u003cli\u003eIntegrated string-through-body locations\u003c\/li\u003e\n\u003cli\u003eHelps maintain neck, bridge, and string-path alignment\u003c\/li\u003e\n\u003cli\u003eReduces repeated measuring and layout operations\u003c\/li\u003e\n\u003cli\u003eEliminates the need to use the finished bridge as a drilling template\u003c\/li\u003e\n\u003cli\u003eReusable across multiple builds using compatible hardware\u003c\/li\u003e\n\u003cli\u003eDesigned for scratch-built and custom instruments\u003c\/li\u003e\n\u003cli\u003eDesigned and manufactured by \u003cstrong\u003eEZO Guitars in Vermont\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eRecommended Workflow\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003e1. Establish the instrument centerline\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDetermine and clearly mark the centerline of the neck and instrument.\u003c\/p\u003e\n\u003cp\u003eThe bridge should ultimately follow the neck and intended string path—not simply the outside perimeter of the body.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e2. Establish your scale-length reference\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eDetermine the instrument's intended scale length and establish the appropriate bridge-position reference on the body.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e3. Align the HSA750 centerline\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003ePosition the HSA750 so its longitudinal centerline agrees with the established neck and instrument centerline.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e4. Position the intonation reference\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eUse the HSA750's horizontal reference line to locate the \u003cstrong\u003emidpoint of the bridge's available intonation adjustment range\u003c\/strong\u003e relative to your scale-length layout.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e5. Verify the complete geometry\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eBefore drilling, verify:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eNeck alignment\u003c\/li\u003e\n\u003cli\u003eInstrument centerline\u003c\/li\u003e\n\u003cli\u003eScale length\u003c\/li\u003e\n\u003cli\u003eIntended string path\u003c\/li\u003e\n\u003cli\u003eSaddle adjustment range\u003c\/li\u003e\n\u003cli\u003eBridge orientation\u003c\/li\u003e\n\u003cli\u003eMounting-hole locations\u003c\/li\u003e\n\u003cli\u003eString-through locations, if used\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003e6. Secure the guide\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eOnce everything agrees, secure the HSA750 so it cannot shift during marking or drilling. We highly recommend double-sided woodworker's tape.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e7. Transfer the mounting locations\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eMark or drill the bridge mounting-hole locations using the guide.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e8. Transfer string-through locations\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eIf building a string-through instrument, use the corresponding guide locations to establish the string holes.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e9. Remove and verify\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eRemove the HSA750 and perform one final verification before drilling any remaining holes to their finished diameter or depth.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eMeasure twice. Verify the geometry. Then make chips.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eCompatibility\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eBridge Type:\u003c\/strong\u003e Hipshot A-Style Bass Bridge\u003cbr\u003e\u003cstrong\u003eConfiguration:\u003c\/strong\u003e 4-String\u003cbr\u003e\u003cstrong\u003eString Spacing:\u003c\/strong\u003e .750\"\u003c\/p\u003e\n\u003cp\u003eThe HSA750 is designed for this specific bridge configuration.\u003c\/p\u003e\n\u003cp\u003eIt should \u003cstrong\u003enot\u003c\/strong\u003e be assumed compatible with other Hipshot bridge models, different string spacings, 5-string configurations, or third-party bridges that appear visually similar.\u003c\/p\u003e\n\u003cp\u003eHardware manufacturers may revise products over time. Always compare your actual bridge to the HSA750 and verify all dimensions before performing permanent drilling or routing operations.\u003c\/p\u003e\n\u003ch2\u003eWhat's Included\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\u003cstrong\u003e1× EZO HSA750 Bridge Layout \u0026amp; Drill Guide\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003eQuick-start installation guide\u003c\/li\u003e\n\u003cli\u003eBridge positioning and alignment instructions\u003c\/li\u003e\n\u003cli\u003eEZO setup and best-practices documentation\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eBridge, drill bits, clamps, and instrument hardware are not included.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003ePart of the EZO Builder System\u003c\/h2\u003e\n\u003cp\u003eAt EZO Guitars, we don't think a good template should simply tell you \u003cstrong\u003ewhere the holes go.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eA good tool should help you understand \u003cstrong\u003ewhy they go there.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThe HSA750 was designed around that philosophy.\u003c\/p\u003e\n\u003cp\u003eThe centerline helps establish alignment.\u003c\/p\u003e\n\u003cp\u003eThe intonation midpoint helps establish bridge position.\u003c\/p\u003e\n\u003cp\u003eThe drill locations transfer the hardware geometry.\u003c\/p\u003e\n\u003cp\u003eAnd the documentation helps explain how those references work together.\u003c\/p\u003e\n\u003cp\u003eOur goal is to turn complicated instrument-building operations into understandable, repeatable processes—whether you're building your first instrument or your fiftieth.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eTemplates establish geometry.\u003cbr\u003eGuides establish relationships.\u003cbr\u003eFixtures control the operation.\u003cbr\u003eKnowledge brings it all together.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch2\u003eBorn on the Workbench\u003c\/h2\u003e\n\u003cp\u003eThe HSA750 wasn't created to fill a product catalog.\u003c\/p\u003e\n\u003cp\u003eIt grew out of an actual instrument build.\u003c\/p\u003e\n\u003cp\u003eWhile developing and building instruments at EZO Guitars, we needed a better way to position and install the Hipshot A-Style bridge—one that accounted not only for mounting holes, but for centerline alignment, scale length, string-through positioning, and the bridge's actual intonation adjustment.\u003c\/p\u003e\n\u003cp\u003eSo we engineered one.\u003c\/p\u003e\n\u003cp\u003eThe resulting tool became the \u003cstrong\u003eEZO HSA750 Bridge Layout \u0026amp; Drill Guide.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eNow it's available for your bench.\u003c\/p\u003e\n\u003ch2\u003eDon't build alone.\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eEZO Guitars — Tools, knowledge, and open design for instrument builders.\u003c\/strong\u003e\u003c\/p\u003e","brand":"EZO Guitars","offers":[{"title":"Default Title","offer_id":55239315980607,"sku":"EZO-HSASB","price":15.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0998\/9573\/8687\/files\/hipshotbridge.png?v=1787925168"}],"url":"https:\/\/ezoguitars.myshopify.com\/collections\/hardware-installation-tools-helpers.oembed","provider":"EZO Guitars Luthier Tools, Templates, and Accessories!","version":"1.0","type":"link"}