<HEAD> <META content="MSHTML 6.00.2900.2963" name=GENERATOR></HEAD> <BODY> <DIV>Mark-</DIV> <DIV>Try putting a little piece of action cloth or felt on top of the cushion and see if that stops it.</DIV> <DIV>Small differences in friction and weight in the key or action parts can change the timing enough for this to happen on some notes.  This sort of problem seems typical of older M & H's, and I haven't solved every one of them....yet.   ;-)</DIV> <DIV>Ed<BR><BR><BR></DIV> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 0px; BORDER-LEFT: #0000ff 2px solid">-----Original Message----- <BR>From: Mark Potter <BASES-LOADED76@SBCGLOBAL.NET><BR>Sent: Sep 25, 2006 2:22 PM <BR>To: ed440@mindspring.com <BR>Subject: Re: action reg puzzler on M & H BB <BR><BR><B><I><A href="mailto:ed440@mindspring.com">ed440@mindspring.com</A></I></B> wrote: <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"><ZZZMETA content="MSHTML 6.00.2900.2963" name="GENERATOR"> <DIV>Mark-</DIV> <DIV>Does this happen after a ff tenuto keystroke, or only after ff staccato (quick blow and release)? What I'm getting at is the possibility that on a fast rebound the hammer may drop below the hammer line enough for the hammer felt to catch on the back check.</DIV> <DIV> </DIV> <DIV><STRONG>This is what I suspect is happening, at least what it 'feels' like is happening, as it does seem more prone to happen on a staccato blow, but certainly not exclusively.  What is most puzzling is that none of the neighboring notes demonstrate this problem, and it is very puzzling why these three do.  Thanks for the suggestion.</STRONG></DIV> <DIV><STRONG>Mark Potter</STRONG><BR><BR></DIV></BLOCKQUOTE> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 0px; BORDER-LEFT: #0000ff 2px solid">-----Original Message----- <BR>From: Mark Potter <BASES-LOADED76@SBCGLOBAL.NET><BR>Sent: Sep 25, 2006 1:41 PM <BR>To: ed440@mindspring.com, Pianotech List <PIANOTECH@PTG.ORG><BR>Subject: Re: action reg puzzler on M & H BB <BR><BR><B><I><A href="mailto:ed440@mindspring.com">ed440@mindspring.com</A></I></B> wrote: <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"><ZZZMETA content="MSHTML 6.00.2900.2963" name="GENERATOR"> <DIV>Mark-</DIV> <DIV>See if the jack is just a little slow to return when it has been held in extreme let-off position for a moment.</DIV> <DIV><STRONG>No, it is fine.</STRONG></DIV> <DIV> </DIV> <DIV>See if the hammer cushion on the wippen is low.</DIV> <DIV><STRONG>It is true that these rest felts are individual ones, rather than a rest rail, so there is SOME slight differences from note to note, but well within tolerances  - ranging from 1/2 the thickness of the shank to perhaps as much as the full thickness.  Interestingly, these three notes span that range (all slightly different, but within the 1/2 - 1 range</STRONG>.</DIV> <DIV> </DIV> <DIV><STRONG>Thanks for the suggestions, though, Ed.</STRONG></DIV><STRONG></STRONG></BLOCKQUOTE> <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid"><STRONG>Mark</STRONG> <DIV><BR><BR></DIV> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 0px; BORDER-LEFT: #0000ff 2px solid">-----Original Message----- <BR>From: Mark Potter <BASES-LOADED76@SBCGLOBAL.NET><BR>Sent: Sep 25, 2006 12:08 PM <BR>To: Pianotech List <PIANOTECH@PTG.ORG><BR>Subject: action reg puzzler on M & H BB <BR><BR> <DIV>List -</DIV> <DIV> </DIV> <DIV>I am having a puzzling problem with a M & H BB grand action that I have never encountered.  Complete regulation (w/new shanks& hammers), everything works great with the exception of 3 notes - F6, A#6, G7 -  in the high treble.  I cannot get this to happen on the bench, and even in the piano when the notes are played softly, even in a trill, they perform perfectly.  However, under continuous mf - ff blows, as in tuning, after anywhere from 1 to 10 strikes (letting the key all the way up), the hammer will get caught on it's way back up by the back check, thereby not allowing it to strike.</DIV> <DIV> </DIV> <DIV>I have tried numerous adjustments to the angle of the back check as well as to the height of check for these 3 notes, to no avail.  Everything seems to be identical to the surrounding notes, including jack reg - both in the window and to the knuckle core -, rep spring strength, key dip, stroke, the arc of the tails, let-off, drop, etc., etc... you name it.  Keys are rebushed and moving freely.</DIV> <DIV> </DIV> <DIV>If anyone can shed some light on this puzzler I would be most grateful!!</DIV> <DIV> </DIV> <DIV>Mark Potter  </DIV></BLOCKQUOTE></BLOCKQUOTE><BR></BLOCKQUOTE></BLOCKQUOTE><BR></BLOCKQUOTE></BODY>