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Mason & Hamlin Tuning Wrench for Screw Stringer Pianos
Mason & Hamlin Tuning Wrench for Screw Stringer Pianos

Mason & Hamlin Tuning Wrench for Screw Stringer Pianos

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Originally, this tool was designed to tune Mason & Hamlin "screw stringer" pianos. Measuring 4-1/2" long and 3/8" wide, this chrome plated wrench is used to adjust the jack regulating screw on current day grand pianos without removing the action.

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