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This classical 3-hole tuner drill jig by John Gilbert makes easy work of an exacting task. The 13/32" holes are industry standard, as is the 70mm (1.378") post hole spacing. For alignment purposes, lines are scribed center to the hole on the outside of the jig. A steel plate can be clamped to and extend out from the head, to act as a stop. Between this steel plate and the jig you may need to add shim stock to center the holes (see photo). If necessary, the jig can be used as a single guide by simply moving it from hole to hole.
Solidly made of cold-rolled steel and drill bushings, it measures: 3 7/8" x 1 1/2" x 3/4"
Use the 13/32" drill bit, HSSJ1332, with this jig.