<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><DIV><SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><SPAN class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><BR class="Apple-interchange-newline"></SPAN></SPAN></DIV><DIV><BLOCKQUOTE type="cite"><DIV><BLOCKQUOTE type="cite"> </BLOCKQUOTE></DIV><DIV>Fred,</DIV><DIV>You mention reaming to get down to 4-6 gm. Reaming introduces heat, which, I would think, would swell the felt. As the felt cools, it would seem there would be a tendency towards lower friction.</DIV><DIV><BR class="khtml-block-placeholder"></DIV><DIV>Just a theory,</DIV><DIV>Jeff</DIV></BLOCKQUOTE></DIV><BR><DIV>Hi Jeff,</DIV><DIV><SPAN class="Apple-tab-span" style="white-space:pre"> </SPAN>What was really puzzling me was that merely removing and replacing pins raised the friction from 1-2 to 3-5 gms. Nothing beyond removing and replacing. But then they went back to 1-2 in not very long, without being played. I expect the teflon impregnated felt expanded in the absence of the pin. Then, with the pin back in, it "conformed" to the pin. But the real issue here is whether or not one can trust what one is doing and measuring with this material - or, at any rate, to what extent one can predict what will occur in the future. If I pin standard felt centers at 6 gms, I can feel fairly certain that they will stay as high as 4 gm for a good while. They will certainly still be at 6 gm when I finish pinning all the flanges, and before the piano gets played a lot. With Teflon impregnated, I'm not so sure. Over the years, I'll get enough experience to come to more of a conclusion, but I was hoping that others who had done more pinning on this material might share their experiences.<BR></DIV><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></BODY></HTML>