> Could you please explain the Screwdriver test for loose pins? > > Thanks and Happy New Year! > > Aart Markenstein Isolate a beating string with mutes. Gently push a screwdriver blade to the side of the speaking length bridge pin opposite the string as you play the note. If the beat stops when the pressure is on the pin, and returns when the screwdriver is removed, the beat is caused by the springing pin. This should be, but rarely is, the very first thing a tuner should do to try and diagnose the cause of the beat before attempting to "fix" anything. Ron N
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