I agree with what Jon has said here, and also watch carefully to see that both strings of the bicord move equally when the damper returns to the strings. If not, the head and felt are not properly spaced to the strings. (adjust above the guide rail for this) Also check front to back lift. I have found that very slight changes in this will mute out one or another offensive overtone. >Also, bending the damper wire so that they do not drag along along one side >of the bushing >will improve dampening. > >On the bichords, you can pinch the tips of the felt with round-nosed pliers >to get them to seat better >between the strings. >
This PTG archive page provided courtesy of Moy Piano Service, LLC