The Alberti Frog Eyelet Fixture

Our Frog Drilling Fixture can be used in the making of new frogs as well as the repair of old frogs. The drills and bushings provided will drill an oversize hole for relining the eyelet hole and the proper size hole for accepting the threaded shank of the eyelet in violin, viola and cello frogs. Bushings and drills for bass frogs as well as custom bushings and drills can be provided for special applications.

To compensate for misaligned under-slides, the fixture features a swiveling support plate which is held in place with a strong magnet so the frog can be removed and replaced in the fixture with perfect realignment. Little training is needed to obtain perfect results from this tool.

To use the fixture, simply place the frog on the swivel plate, clamp it in place by lowering the bushing arm with the knurled nut, and center it with the pointed end of the centering tool provided or, with new frogs, align with the mark on the clamping arm. Before clamping tightly, the frog is brought into lateral alignment by rocking the swivel plate. With the correct drill and bushing selected, drilling is carried out with a drill press (preferred) or hand drill. The slotted end of the centering tool will drive the eyelet in with perfect alignment to the frog.

When relining the eyelet hole, the adjustable stop should be used to facilitate perfect relocation of the frog. The frog is drilled oversize, removed to plug the hole, and replaced in the fixture to re-drill with the smaller drill and drill bushing. The stop can also be used to locate new frogs for initial drilling.

  • With Drills and Bushings for Violin and Cello – $360
  • With Drills and Bushings for Violin, Cello, and Bass – $420

To Order Call 800-982-4464

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