Installing an ABR-1 Guitar Bridge
As the original Tune-O-Matic bridge for Gibson electric guitars, the ABR-1 bridge became available in 1954. Before its introduction, Gibsons featured a wraparound bridge design, which did not provide for optimal intonation and height adjustment for the strings. Using a fixed-bridge design, the ABR-1 bridge first appeared on the Les Paul Custom guitar and set a new standard for functionality and simplicity. If you have a fixed-bridge electric guitar, you can convert the existing bridge to an ABR-1 using a few simple tools. Another option is to take your instrument to a professional guitar builder or repair technician who can install the new bridge, if you lack the necessary tools.
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Instructions
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Remove the guitar strings. Uninstall the existing bridge with a screwdriver that fits the slots. Using a bushing removal tool, take out the bushings, which are the cylindrical metal sleeves lined with screw threads.
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Install the ABR-1 bushings and screw in the new bridge studs -- or posts -- using a socket wrench.
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Adjust the studs to the proper height, roughly the same as the bridge with clearance for guitar strings. Spin the thumbwheels onto the studs. After installation, the thumbwheels will allow you to change the bridge’s height as needed.
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Place the ABR-1 bridge onto the studs so that it rests on the thumbwheels.
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Restring the guitar, threading the strings into the ABR-1 bridge. Once installed and under string tension, you can raise or lower the bridge by turning the thumbwheels. If you have a bridge jack, use it to lift the bridge body slightly and allow a wider range of motion as you adjust the thumbwheels.
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Tips & Warnings
Don't attempt to install an ABR-1 bridge yourself, unless you have the right tools. Contact a professional who is experienced with Gibsons and Tune-O-Matic bridges. Using the wrong tools may strip the hardware or scratch the finish of your instrument.
References
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