<!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 6.00.2716.2200" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>You've got ten times the experience I = have, but these are my random thoughts and questions:</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>If the lower notes ARE checking = properly, what is different in the regulation of those?</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Has this been a problem since the = hammers were installed or something new? </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Are the shank-pin-dropscrew-flange = screw hole locations/dimensions all correct for this M? Seems like the shank length = could be just fine with the hammer at rest but, based on the pin center, = f'rinstance, the swing radius could be off with the hammer tail missing the backchecks.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Same with those knuckles you mentioned = ... is the hammer-to-string distance correct with the hammers at rest?</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Tail arc radius too small? Tails too = smooth? Backcheck leather glazed, worn, compressed? </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Any "pulley" to those keys or shift of = the balance rail, i.e., does playing the key push the backcheck slightly away from = the hammer?</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>I don't know what I'm going on about. = Grand checking seems a mysterious art form to me -- so many things have to be = right on. I'm attending a weekend PTG regulation workshop in Joplin, MO this = weekend ... maybe I'll have </FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Alan R. Barnard</FONT></DIV> <DIV><FONT face=Arial size=2>Suggesting in Salem, MO</FONT></DIV> <BLOCKQUOTE style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; = BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A title=Wimblees@aol.com = href="mailto:Wimblees@aol.com">Wimblees@aol.com</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=Pianotech@PTG.org href="mailto:Pianotech@PTG.org">Pianotech@PTG.org</A> ; <A = title=caut@ptg.org href="mailto:caut@ptg.org">caut@ptg.org</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, October 15, 2002 = 5:47 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> bobble heads</DIV> <DIV><BR></DIV><FONT face=arial,helvetica><FONT lang=0 = face=Arial size=2 FAMILY="SANSSERIF">Problem: Bobbling hammers on a S&S M from C5 = on down. I mean, they don't even check on a hard blow.  Some of them are = checking, but only on a hard blow. The rest just bobble. New hammers, shanks and = flanges. <BR><BR>Let off is right, drop is right, there is after = touch. I changed let off, I changed drop.  Keys are level, right amount of = dip.  I increased dip, decreased dip. I've increased rep spring, = and decreased rep spring. Dampers are not in the way. Nothing. = <BR><BR>This is a 1939 model. There has been some discussion about knuckle size.  = As I said, these are relatively, (about 3 years old) new h/s/f/ , with 3/8" = knuckles. Could that have an effect?<BR><BR>Wim </FONT></FONT></BLOCKQUOTE></BODY></HTML>