<html> <body> Hi Don,             The most likely cause will be the jack spoon button.  Many of the Korean pianos used a woven cloth instead of the more resilient felt,   The cloth gets hard and it makes a horrible noise when the button connects with the spoon. Another thing to check,  is the drop button leather.  Around this time a synthetic was used, and it hardens with age.  On release from check the balancier clatters against the drop screw. With the first problem, needling the cloth can reduce the problem. Bin thar, done dat, it's a BS fix at best.  Now I bite the bullet and change the felt buttons.   You will have to reposition the spoons, due to the fact the felt punchings are thicker than the cloth. With the drop screw leather, the only fix is replace them with quality material.  Carefully mark the hammer rail position with respect to the brackets.  Remove the hammer rail, and the tops of the wippens are exposed so you can work on them,  Remember to include a major regulation in your estimate. Regards Roger At 08:29 PM 12/7/2005, you wrote: <blockquote type=cite class=cite cite="">List   -   I worked on a Young Chang grand today.  Purchased new about 6 years ago.   The jacks are making a fairly pronounced click upon release of the key.   A model G157.   Each jack seems to be making about the same amount of noise.   When releasing a 6 or 7 note chord, the combined sound of those 6 or 7 jacks is quite obvious.   I believe the problem is  the  round hard felt on the jack. Anyone run into this before?    How did you fix the problem?   Is this a warranty problem?   I called Young Chang, but have not received a return call. I happened to have another Young Chang at the end of the day which I was checking for a church.  A 6' 10" I believe.  No jack noise at all on the key release. Thanks. Don _______________________________________________ pianotech list info: <a href="https://www.moypiano.com/resources/#archives" eudora="autourl"> https://www.moypiano.com/resources/#archives</a> </blockquote></body> </html>