<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=iso-8859-1" = http-equiv=Content-Type> <META content="MSHTML 5.00.3314.2100" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT size=4>David, </FONT></DIV> <DIV><FONT size=4>If you are using an epoxy that is made specifically = for ''gluing", actually bonding is the better term, wood together, then it = is ok to clamp. I have seen failures were generic type epoxy was used and then = clamped. Every one failed. As for the solvents to clean up the epoxy. It has been = my experience that it is not adviseable. I personally have had failures due = to cleanup, before the epoxy is set. If'n you don't believe me, ask a = chemist, etc.</FONT></DIV> <DIV><FONT size=4>I've been doing epoxy repair on bridges for over = 20years. The examples I cited above were my failures. So take it or leave it. <grin></FONT></DIV> <DIV><FONT size=4>Joe</FONT></DIV> <DIV></DIV> <BLOCKQUOTE dir=ltr style="BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: = 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A href="mailto:davidlovepianos@earthlink.net" title=davidlovepianos@earthlink.net>David Love</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = href="mailto:pianotech@ptg.org" title=pianotech@ptg.org>pianotech@ptg.org</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, August 31, 2001 = 7:51 PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: split bridge</DIV> <DIV><BR></DIV> <DIV><FONT size=2>Joe:</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>Why would you not clamp epoxy?  The = bridge needs to be pulled back together, among other reasons, to get the pins = back in the right position.  My conversation this date with Roger = Weisensteiner confirmed my belief that this would be the method of choice = for making this repair.  He suggested using a two part epoxy (e.g. = West System type) and clamp it back together reinserting the pins either = before or after it dried.  My concern with after is that if I have = to redrill the case might be in the way.  So I will probably reinsert the = pins before it dries.</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>Regarding solvents and epoxy, I have, in the past, = repinned bridges putting a drop or two of epoxy in the bottom of the bridge pin = hole prior to inserting the pin.  The squeeze out I have cleaned up by = brushing it onto the notch using an acid brush with a bit of lacquer thinner.   I think I may have been introduced to this = technique by Bill Spurlock in a Journal article in fact.  Though I recognize = the controversy surrounding epoxying bridge pins in, I wasn't aware that a = bit of lacquer thinner was compromising the strength of the epoxy.  </FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>David Love</FONT></DIV> <BLOCKQUOTE dir=ltr style="BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; = MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A href="mailto:joegarrett@earthlink.net" title=joegarrett@earthlink.net>Joseph Garrett</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = href="mailto:pianotech@ptg.org" title=pianotech@ptg.org>pianotech@ptg.org</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> August 31, 2001 5:47 = PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: split = bridge</DIV> <DIV><BR></DIV> <DIV><FONT size=4>David,</FONT></DIV> <DIV><FONT size=4>It is not adviseable to "clamp" epoxy. Use a gap = filling type and just let it set to almost, then clean up by scraping, etc. = Also not adviseable to use the compatible solvent, of which there are two, = (there may be more), Alcohol and lacquer thinner are verboten, it will simply = break down the strenght of the epoxy. I personally use "steel epoxy" for = this kind of repair.</FONT></DIV> <DIV><FONT size=4>regards,</FONT></DIV> <DIV><FONT size=4>Joe Garrett</FONT></DIV> <DIV></DIV> <BLOCKQUOTE style="BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; = MARGIN-RIGHT: 0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px"> <DIV style="FONT: 10pt arial">----- Original Message ----- = </DIV> <DIV style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: = black"><B>From:</B> <A href="mailto:davidlovepianos@earthlink.net" title=davidlovepianos@earthlink.net>David Love</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A href="mailto:pianotech@ptg.org" = title=pianotech@ptg.org>Pianotech</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, August 31, = 2001 10:07 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> split bridge</DIV> <DIV><BR></DIV> <DIV><FONT size=2>I have a customer with a Boesendorfer 225 c = 1978.  The bridge is splitting along the speaking side pin line on the = top 5-6 notes.  I'm not sure how long it has been this way, this is = the first time I've seen the piano.  My intention is to remove strings = from this area, work epoxy into the crack, pull it all back together = with clamps and clean off the excess with a bit of lacquer = thinner.  Any comments.</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>David Love</FONT></DIV></BLOCKQUOTE></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>