<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"> <META 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>