<html> <body> Is the jack getting back under the knuckle after a soft blow? I'd check that. Avery At 06:48 AM 7/8/04, you wrote: <blockquote type=cite class=cite cite>On Jul 8, 2004, at 1:10 AM, Alpha88x@aol.com wrote: <blockquote type=cite class=cite cite> Greetings,             About a month ago I was called to a Young Chang grand piano. The customer complained of one key's hammer not returning after a pianissimo (soft) blow. On some forte (harder) blows it didnt return either. After taking ourt the action drawer and examining the key's power train, I did not see anything visibly that could be causing such a thing, except that the hammer was slightly close to the next key's hammer. I loosened the key's hammer in question and straighttened it out alittle so that it was in line as it should be, and that helped alittle, but the sticking hammer remained sticking ...but not quite as often, So it alleviated the problem alittle but not all together.  </blockquote> While providing proper clearance for the moving parts is essential, you should have also checked the friction in the flanges: hammer, jack, and wippen. And the purists may even urge you to check the resistance of the balancier flange. A gram resistance gauge  can be very helpful. Oh, and how is the clearance for the jack in the balancier window? How's the repetition spring strength? And something that the fellows at the party *could* have damaged with their antics: is the jack tail firm? They could have damaged the glue joint between the tail and body of the jack. Just a few of the possible causes (tight flanges being my best guess) ... Patrick Draine </blockquote></x-html> </blockquote></body> </html>