List, A customer recently purchased a used M&H grand out of the 1960's. Nearly every tuning pin in the piano jumps badly. Can someone shed light on why this condition develops? Is there any good fix for it short of replacing the tuning pins? Is it possible to apply anything (i.e. tuning pin tightener, etc) to the bottom of the tuning pin hole? I and my customer would appreciate any suggestions. Thanks Paul Stephens, RPT
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