Mr. Ward, A look inside a piano, or some harpsichords will reveal that they dampen the vibration of the unstopped strings with pieces of felt wound between the strings. I would try a piece of felt about 2mm wide. Wind it between the offending strings at the bridge. For more dampening, move the felt forward, away from the bridge. If 2mm of felt is too much, try a piece of yarn. Lou Aull
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