<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=Content-Type content="text/html; charset=US-ASCII"> <META content="MSHTML 6.00.2800.1491" name=GENERATOR></HEAD> <BODY id=role_body style="FONT-SIZE: 10pt; COLOR: #000000; FONT-FAMILY: = Arial" bottomMargin=7 leftMargin=7 topMargin=7 rightMargin=7><FONT id=rol= e_document face=Arial color=#000000 size=2> <DIV> <DIV>In a message dated 3/3/05 6:21:21 P.M. Central Standard Time, okeyes@uidaho.edu writes:</DIV> <BLOCKQUOTE style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid"><= FONT style="BACKGROUND-COLOR: transparent" face=Arial color=#000000 size= =2>Just ran across something on one of our D's that I found interesting, but<BR>perplexing.  There was a bit of hammer bobbling on a few of th= e notes on a<BR>soft blow.  These are relatively new hammers, shank &am= p; flanges, so made some<BR>adjustments in let-off since compaction had cause= d things to get a little<BR>close.  I like to set the let-off as close = as is reasonable, with<BR>appropriate safety margins.<BR></FONT></BLOCKQUOTE>= </DIV> <DIV></DIV> <DIV>Otto</DIV> <DIV> </DIV> <DIV>I don't believe the bobbling is connected to let off, or to the conditi= on of the knuckle. I think the bobbling is related to the rep spring, and the curvature of the tail. Reduce the rep spring quite a bit, and arc the tail m= ore, and you'll solve your bobbling problem. </DIV> <DIV> </DIV> <DIV>Wim </DIV></FONT></BODY></HTML>