<!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 6.00.6000.16448" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY style="WORD-WRAP: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space" bgColor=#ffffff> <DIV><FONT face=Arial size=2>Tom-</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Bill Spurlock published an article on epoxy treatment of bridges before restringing (PTJournal ca 1995).  I think Ron Nossaman's approach of drilling deeper and driving the pins to height is a good improvement.  Renotching and repinning with epoxy seems to give a clearer sounding instrument, and also seems to be less sensitive to humidity.  It's a standard procedure in my little shop.</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Pianos being the complex and expensive gadgets that they are, we don't get many chances to make controlled comparisons.</FONT></DIV> <DIV><FONT face=Arial size=2>You are in the interesting position of rebuilding two M's at the same time.  Surely there is some special comparison you can make!</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Ed Sutton</FONT></DIV> <DIV><FONT face=Arial size=2></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=trussellpiano@isunet.net href="mailto:trussellpiano@isunet.net">Thomas Russell</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A title=caut@ptg.org href="mailto:caut@ptg.org">caut@ptg.org</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, June 12, 2007 2:26 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> [PHISH] Re: [CAUT] treating existing bridges in restringing</DIV> <DIV><BR></DIV> <DIV> <BLOCKQUOTE type="cite">Greetings,<BR></BLOCKQUOTE> <DIV><BR class=khtml-block-placeholder></DIV>I would be interested in reading about what you do to treat bridges with CA or epoxy when restringing.  I have a pair of Steinway Ms that I will be working on this summer.</DIV> <DIV><BR class=khtml-block-placeholder></DIV> <DIV>Tom Russell</DIV> <DIV>Iowa State University<BR> <BLOCKQUOTE type="cite"> <BLOCKQUOTE><BR></BLOCKQUOTE> <DIV> <BLOCKQUOTE type="cite"> <DIV style="MARGIN: 0px"><FONT style="FONT: 12px Helvetica" face=Helvetica size=3>I've been using epoxy in original bridge caps for 30 years, and CA on occasion for over 10. It certainly improves tone quality and minimizes false beating, and does seem to narrow pitch swings with seasonal changes. I've done testing with bridge models of various types, and epoxy or CA saturation of at least the cap does improve dimensional stability with humidity shifts.</FONT></DIV> <DIV style="MIN-HEIGHT: 14px; MARGIN: 0px; FONT: 12px Helvetica"><BR></DIV> <DIV style="MARGIN: 0px"><FONT style="FONT: 12px Helvetica" face=Helvetica size=3>Ron N</FONT></DIV></BLOCKQUOTE></DIV>Hi Ron,<BR> <DIV><SPAN class=Apple-tab-span style="WHITE-SPACE: pre"></SPAN>When you say epoxy or CA saturation, what do you mean in terms of method used to saturate? Are these methods one could use on an existing bridge in a piano?</DIV> <DIV><BR> <DIV> <DIV>Regards,</DIV> <DIV>Fred Sturm</DIV> <DIV>University of New Mexico</DIV> <DIV><A href="mailto:fssturm@unm.edu">fssturm@unm.edu</A></DIV> <DIV><BR class=khtml-block-placeholder></DIV></DIV><BR><BR class=khtml-block-placeholder></DIV> <DIV><BR class=khtml-block-placeholder></DIV> <DIV><BR class=khtml-block-placeholder></DIV> <DIV style="MARGIN: 0px">_______________________________________________</DIV> <DIV style="MARGIN: 0px">caut list info: <A href="https://www.moypiano.com/resources/#archives">https://www.moypiano.com/resources/#archives</A></DIV></BLOCKQUOTE></DIV><BR></BLOCKQUOTE></BODY></HTML>