Piano Mason and Hamlin Screw Stringer Wrench

Professional Grand Piano Mason and Hamlin Screw Stringer Wrench.

Designed to tune Mason & Hamlin screw stringer pianos and can also be used to adjust the jack regulating screw on modern grand pianos without removing the action.

 A screw stringer piano has no tuning pins.

This special tuning wrench fits on the metal tuning nuts.

Overall length is 4-1/2" long, 3/8" wide

Article courtesy Gemm Piano Supply

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