<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; = charset=iso-8859-1"> <META content="MSHTML 6.00.2800.1126" name=GENERATOR></HEAD> <BODY lang=EN-US vLink=#800080 link=#0000ff> <DIV>Clyde it is sometime not a dip problem, even if it looks like (hammer don't drop).</DIV> <DIV> </DIV> <DIV>been caught there = yet too</DIV> <DIV> </DIV> <DIV>Best</DIV> <DIV> </DIV> <DIV>Isaac OLEG Entretien et réparation de pianos. PianoTech 17 rue de Choisy 94400 VITRY sur SEINE FRANCE tel : 033 01 47 18 06 98 fax : 033 01 47 18 06 = 90 cell: 06 60 42 58 77 </DIV> <BLOCKQUOTE dir=ltr style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px = solid; MARGIN-RIGHT: 0px"> <DIV class=OutlookMessageHeader dir=ltr align=left>-----Message d'origine----- De : pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]De la = part de Clyde Hollinger Envoyé : vendredi 7 mars 2003 13:28 À : Pianotech Objet : Re: Yamaha = U1 regulation problem </DIV>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>@page Section1 {size: 8.5in 11.0in; margin: 1.0in 1.25in = 1.0in 1.25in; } P.MsoNormal { FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman" } LI.MsoNormal { FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman" } DIV.MsoNormal { FONT-SIZE: 12pt; MARGIN: 0in 0in 0pt; FONT-FAMILY: "Times New Roman" } A:link { COLOR: blue; TEXT-DECORATION: underline } SPAN.MsoHyperlink { COLOR: blue; TEXT-DECORATION: underline } A:visited { COLOR: purple; TEXT-DECORATION: underline } SPAN.MsoHyperlinkFollowed { COLOR: purple; TEXT-DECORATION: underline } SPAN.EmailStyle17 { COLOR: windowtext; FONT-FAMILY: Arial } DIV.Section1 { page: Section1 } </STYLE> <DIV class=Section1> <DIV class=MsoNormal>List</DIV>           &nb= sp; I recently serviced a U1 vertical for a first time client. Excellent = piano very little wear and -tuned up quite = well.            &nb= sp; I did however find lettoff to be over !/4 “and inconsistent.            &nb= sp; 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)           &nb= sp; 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.           &nb= sp; My client called again with the same problem and called other = technicians for advice also            &nb= sp; 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.            &nb= sp; P.S.  Backchecks are also adjusted---I.E. catchers are not = bouncing out or off of the backchecks           &nb= sp; Tom Driscoll RPT</DIV></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML= >