Try lightly tapping the offeneders right and left with a brass drift on both side of the agraffe. There may be a burr in the brass. If this is the case tapping with move it out of the way of the string. ALso check the condition of the bridge, pins and bearing. If there are no agraffes move the strings back and forth on both sides of the proper resting position. This will knock off any burrs on the capo bar. If it persists lower tension enough to unbridge a string and then bring the string back up to tnesion enough to determin if the string is providing proper dearing. You may find the string above the bridge, touching at the back of the bridge first. If it show proper bearing then place it back in its normal position after checking for a loose bridge pin. If this does not show or solve the problem then it is in the piano elsewhere and to knwo where to start looking I would almost have to hear the noise. I hope this is helpful. Newton nhunt@jagat.com
This PTG archive page provided courtesy of Moy Piano Service, LLC