<!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 6.00.6000.16587" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#d8d0c8> <DIV><FONT size=2>Could it be the air gap effect, like between knuckle core and cover, and in the layers of the whippen heel?</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>--Cy--</FONT></DIV> <DIV><FONT size=2>ABQ, NM</FONT></DIV> <BLOCKQUOTE dir=ltr 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=pianoforte@pianofortesupply.com href="mailto:pianoforte@pianofortesupply.com">Jurgen Goering</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A title=pianotech@ptg.org href="mailto:pianotech@ptg.org">pianotech@ptg.org</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> Wednesday, February 06, 2008 10:20 AM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> Re: Two felts better than one? / was: Andre's Front Punchings</DIV> <DIV><FONT size=2></FONT><BR></DIV>Many pianos had a thin felt strip (1.5 - 2 mm) underneath the back rail cloth. It appears that 2 mm of felt under 5 mm of cloth is more quiet than one 7 mm strip of cloth.<BR><BR>Can anyone corroborate this?<BR><?smaller><BR>Jurgen Goering<BR> <BLOCKQUOTE><FONT size=2></FONT> </BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>