<HTML>Hello again, It's been a week for pain-in-the-posterior piano problems.  A coupl= e of months ago, I was called to come and see if I could figure out and fix = a problem with bubbling hammers on a Story and Clark console piano with QRS = pianomation installed.  When I got there, almost every hammer was bubbl= ing.  Key height was fine, but the dip was way to shallow.  I repl= aced the fat front rail felt punchings with more meager ones, did a bit of r= egulation, and the problem was gone...at least for the time being. I got a call from the lady a couple of weeks ago complaining of a few mo= re bubbling hammers.  I got a chance to go out yesterday, and with a sm= all amount of let-off adjustment on a few notes the problem seemed to be cur= ed--until I pushed the sustain pedal down.  I could not make all of the= hammers check when the sustain pedal was engaged. Can anyone tell me if there is some connection between pedal/damper func= tion and the QRS mechanism?  It doesn't seem as though there should be,= but I have never installed or worked on one of these. The problem seems to be that when the sustain pedal is down and the damp= ers up, there is not enough strength in the springs to push the hammers back= quickly enough to catch on the backchecks.   My thought is to check the tightness of the whippen and hammer centers. =  The action feels far more sluggish than it did the first time I worked= on it.  I suspect moisture or something else has invaded the bushings.=  Maybe graphite coated center pins???  I certainly hope not. &nbs= p;Been there before. Any thoughts or recommendations for possible courses of action would be = appreciated. Thanks again! Dave Stahl</HTML>