<TABLE id=HB_Mail_Container height="100%" cellSpacing=0 cellPadding=0 width="100%" border=0 UNSELECTABLE="on"> <TBODY> <TR height="100%" width="100%" UNSELECTABLE="on"> <TD id=HB_Focus_Element vAlign=top width="100%" background="" height=250 UNSELECTABLE="off">Yes, and the fix I employed was to change the butt felt squares with thick ones.</TD></TR> <TR UNSELECTABLE="on" hb_tag="1"> <TD style="FONT-SIZE: 1pt" height=1 UNSELECTABLE="on"> <DIV id=hotbar_promo></DIV></TD></TR></TBODY></TABLE> <BLOCKQUOTE id=9e51b011> <DIV> James Ellis <claviers@nxs.net> wrote: <BLOCKQUOTE class=replbq style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">I have been reading your various posts on the subject of bobbling hammers on Yamaha uprights. I tune a fairly new Yamaha P22 that has just started doing it on a few hammers, but by no means all of them. I looked closely to see why. It is NOT regulation. It is NOT damper spring strength. It is NOT that I don't follow through on the key stroke. In fact, most of the hammers don't bobble, no matter how I play. On those that do, I have to pound hard, or they will. Those things I just mentioned: NONE OF THE ABOVE. Here is what I found. It's the shape of the butt and butt leather. On those that are bobbling, there is more of a lump at the very front of the leather than on those that don't bobble. I found two hammers, side by side. One always bobbled, unless I banged it hard. The other never did. I pressed both keys down firmly. Both jacks moved back by the same distance. One bumped the outward end of the butt leather, but the other did not. This is the only piano I tune regularly that has this problem, but it does, and on a few notes, it has it bad. Otherwise, it's a very nice piano. Keep this in mind before you go bending things as a quick fix. The quick fix is a tiny bit more dip, or a tiny bit closer checking, or a very slightly sooner let off, or a combination of all. But that's not the real fix. The real fix would be to get that hump off the front end of the butt learher. Otherwise, the jack will have to fly way back, farther than it should, to clear it. That's what I found on this particular piano. Jim Ellis _______________________________________________ caut list info: https://www.moypiano.com/resources/#archives</BLOCKQUOTE></DIV></BLOCKQUOTE> Vince Mrykalo University of Utah <hr size=1>Do you Yahoo!? Yahoo! Photos: <a href="http://pa.yahoo.com/*http://us.rd.yahoo.com/evt=23765/*http://photos.yahoo.c om/ph/print_splash">High-quality 4x6 digital prints for 25¢</a>