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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