<!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 6.00.6000.16525" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV style="FONT: 10pt arial">----- Original Message ----- <DIV style="BACKGROUND: #e4e4e4; font-color: black"><B>From:</B> <A title=donmannino@ca.rr.com href="mailto:donmannino@ca.rr.com">Don Mannino</A> </DIV> <DIV><B>To:</B> <A title=pianotech@ptg.org href="mailto:pianotech@ptg.org">'Pianotech List'</A> </DIV> <DIV><B>Sent:</B> Saturday, August 11, 2007 9:21 PM</DIV> <DIV><B>Subject:</B> RE: action center question</DIV></DIV> <DIV><BR></DIV> <DIV dir=ltr align=left><SPAN class=468401002-12082007><FONT color=#000080>Brittney,</FONT></SPAN></DIV> <DIV dir=ltr align=left><SPAN class=468401002-12082007><FONT color=#000080></FONT></SPAN> </DIV> <DIV dir=ltr align=left><SPAN class=468401002-12082007><FONT color=#000080>Here are my usual guidelines, with notes.  Gram measurement is made with a spring gauge at the screw hole, except where noted.</FONT></SPAN></DIV><BR> <BLOCKQUOTE dir=ltr style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000080 2px solid; MARGIN-RIGHT: 0px"> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left>hammer flange centers<SPAN class=468401002-12082007><FONT color=#000080> </FONT></SPAN></DIV></BLOCKQUOTE> <DIV class=OutlookMessageHeader lang=en-us dir=ltr align=left><SPAN class=468401002-12082007><FONT color=#000080>Depends on felt quality and firmness. My usual range would be 2 - 6 grams, depending on humidity and bushing quality. 2g during dry conditions is OK with good bushings, but will give poor tone with spongy bushings.  If it's raining and the bushings are not especially firm feeling, pinning at 6 grams might be good.  Evenness from note to note is most important in this center.</FONT></SPAN></DIV> <BLOCKQUOTE dir=ltr style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000080 2px solid; MARGIN-RIGHT: 0px"> <DIV>whippen flange centers<SPAN class=468401002-12082007><FONT color=#000080> </FONT></SPAN></DIV></BLOCKQUOTE> <DIV dir=ltr><SPAN class=468401002-12082007><FONT color=#000080>4 - 6 grams</FONT> </SPAN></DIV> <BLOCKQUOTE dir=ltr style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #000080 2px solid; MARGIN-RIGHT: 0px"> <DIV>balancier center<SPAN class=468401002-12082007><FONT color=#000080> </FONT></SPAN></DIV></BLOCKQUOTE> <DIV dir=ltr><SPAN class=468401002-12082007><FONT color=#000080>4 - 5 grams measured at the drop screw pad (with spring detached, of course).</FONT> <FONT color=#000080>  This is a very tight feeling bushing when you are testing with the center pin.</FONT></SPAN></DIV> <DIV dir=ltr><SPAN class=468401002-12082007><FONT color=#000080></FONT></SPAN> </DIV> <DIV dir=ltr><SPAN class=468401002-12082007><FONT color=#000080>Jack should be pinned so that it falls slowly of it's own weight when the wippen is held with the jack tender pointing up.  This give a correct amount of friction to match the weight of the upper part of the jack, which helps control unwanted jack bounces during fast play.</FONT></SPAN></DIV> <DIV dir=ltr><SPAN class=468401002-12082007><FONT color=#000080></FONT></SPAN> </DIV> <DIV dir=ltr><SPAN class=468401002-12082007><FONT color=#000080>Don Mannino</FONT></SPAN></DIV></BODY></HTML>