<html> At 08:33 AM 8/20/2002 -0500, you wrote: <blockquote type=cite cite>List, One solution for this is to install thicker jack stop felt in the repetition window. I discussed this problem with Eric Schandel from Steinway, and this was a suggestion he offered. He had no explanation why some clicked and others didn t. We were able to do this and had success with it. Sincerely, Gary Mushlin, RPT </blockquote> Ultimately, the reason for this is that the key is driving the wippen through too great a distance. Knuckle radius has a very minor affect on this, Key Ration is the culprit.  You need to move the capstans forwards to have the action regulate optimally. What you have is too much after touch. You can fudge the faults to attenuate the symptoms by increasing hammer blow and/or decreasing dip. But for a given set of parameters (Key Height, Dip, knuckle radius, Hammer blow, hammer length), there is an optimal KR which produces minimal after touch, that is for the jack to just clear the knuckle at full dip. Sometimes the wippen heel needs to be relocated as well to maintain the cushion over the relocated capstan. Jon Page</html>