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<DIV style="FONT: 10pt arial"><FONT face="Times New Roman" color=#000080
size=3>Sounds like the backcheck wire is loose in the key. After repeated
blows it will change.</FONT></DIV><FONT
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<DIV style="FONT: 10pt arial"><BR>R.Moffatt & Sons<BR>Piano
Technicians<BR>2323 Lincoln Drive S.W.<BR>Calgary, Alberta , Canada T3E
5G4<BR>Phone. 403.243.0385<BR><A
href="http://www.moffattpianos.com">www.moffattpianos.com</A><BR>Fax.
403.243.6821<BR>email: <A
href="mailto:moffatt5@telus.net">moffatt5@telus.net</A></DIV>
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Original message<BR>From: "Mark Potter" <BASES-LOADED76@SBCGLOBAL.NET><BR>To:
"Pianotech List" <PIANOTECH@PTG.ORG><BR>Received: 09/25/2006 11:08:06
AM<BR>Subject: action reg puzzler on M & H BB<BR><BR>
<DIV align=left>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></DIV>
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<P></P>No virus found in this incoming message.<BR>Checked by AVG Free
Edition.<BR>Version: 7.1.405 / Virus Database: 268.12.8/455 - Release Date:
9/22/2006<BR></BLOCKQUOTE></BODY></HTML>