<DIV>The tail arcing was done with the Spurlock jig.  Only the shank/flanges and hammers have been changed.  So, yes drop is changed. Balancier is same. They had a drop of maybe 3/8 below letoff on the old and I'm doing more like 1/16 below let off for drop.  The old let off is about 1/32 in mid range.     I believe backchecks are leaning slightly away at rest, I'll have to look again Monday when I'm back at the piano.  </DIV> <DIV> </DIV> <DIV>If the jack is not resetting under the knuckle during fast repetition, is the knuckle being sent flying up again from contact with the top of the rep. lever ?  I decided bouncing was not a good word since it implies that one or  both of the parts are being set into motion through a compression and release of energy from their surface.  I'm sure the knuckle surface compacts or compresses but not in the same sense as a basketball.  </DIV> <DIV>  Bob Hull<BR></DIV> <DIV><B><I>A440A@aol.com</I></B> wrote:</DIV> <DIV> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid; WIDTH: 100%">I wrote:<BR><< >Repetition speed is usually more dependant on checking distance than <BR>>anything else. How far away from the string are these new hammers >checking? <BR><BR>Bob sez:<BR>>>I set the checking distance of the new long bored distance hammer at the <BR>same height as the old hammer and the new did not repeat anything like the old.<BR>During very fast repetition, does the hammer tail come into contact with <BR>the backcheck even if the checking distance is set as high as possible (but <BR>not so high that it drags on the way up), or isn' t the knuckle bouncing off of <BR>the top of the jack? <<<BR><BR>Are the tails shaped on a 2.5" radius? and are the back-checks leaning <BR>slightly away from the tail at rest? <BR>As far as knuckles bouncing off the top of the jack, the jack has to be <BR>under it to do that, so the knuckle will to either need to lose contact with <BR>the jack on the way up, or the jack must find time to reset. <BR>Was the only thing changed in this action the hammers? No changes to drop, <BR>spring or balancier? <BR><BR>Ed Foote RPT <BR>www.uk-piano.org/edfoote/<BR>www.uk-piano.org/edfoote/well_tempered_piano.html<BR><A href="http://artists.mp3s.com/artists/399/six_degrees_of_tonality.html"><BR>MP3.com: Six Degrees of Tonality</A><BR>_______________________________________________<BR>pianotech list info: https://www.moypiano.com/resources/#archives</BLOCKQUOTE></DIV><p><hr SIZE=1> Do you Yahoo!?<br> <a href="http://us.rd.yahoo.com/evt=10469/*http://sitebuilder.yahoo.com">Yahoo! SiteBuilder</a> - Free, easy-to-use web site design software