<!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html> <body link="#0000FF" vlink="#800080" lang="EN-US"> Tom, OK, I certainly hope someone gives you a good answer, because I NEED IT, TOO! I get so frustrated when I find this in pianos that I have been recommending.  For those with modest piano replacement budgets I've been recommending the P22.  My daughter just bought one. Last week I serviced a 1978 Yamaha P202 with a number of torn flange cords, which is part of the problem, and another part of the problem is insufficient dip in the center.  So I need to replace the flange cords and do a good job of key leveling.  On a few keys where I already put in a new flange, I was able to stop the bobble by removing front rail punchings to increase the key dip.  I thought that was probably the answer, but I hate doing things sort of slipshod like this.  I would rather have more-than-average keydip on the whole piano than here and there.  But the question in my mind is, if I *did* increase key dip, either at the front or balance rails, would that solve the problem? I once thought I could just shim up the whole balance rail a little.  In that Yamaha P22 the thing was *glued down*!! Is it the springs, as Ken Jankura thinks?  Should I stop recommending Yamaha verticals?  :-( HELP! Regards, Clyde Tom Driscoll wrote: <blockquote TYPE=CITE><style>  </style> <div class=Section1> <div class="MsoNormal">List</div>             I recently serviced a U1 vertical for a first time client. Excellent piano very little wear and -tuned up quite well.              I did however find lettoff to be over !/4 “and inconsistent.              I adjusted to 1/8” –and took up lost motion. Tightened action screws. The key dip and after touch were sufficient, and the jacks are free to travel away from the butts---no interference from that adjustable rail—(sorry, I forget Y’s nomenclature on that component)             My client has a light touch and the action still stutters I returned, shortened blow distance readjusted lost motion, and adjusted spoons to re-correct damper timing.             My client called again with the same problem and called other technicians for advice also              I know bobbling hammers can be a problem on Yamaha verticals and I’ve worked on hundreds of these, but I can’t shorten blow any more and as I mentioned, keydip-aftertouch are correct. I’m hesitant to increase lettoff back to its original excessive amount, so esteemed colleagues ---Any suggestions? I’m going back next week.              P.S.  Backchecks are also adjusted---I.E. catchers are not bouncing out or off of the backchecks             Tom Driscoll RPT</div> </blockquote> </body> </html>