<!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 6.00.2600.0" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT size=2>Using 60 grit paper should leave the tails rough = enough for good checking if the arc is the correct radius and the backcheck is = set at the correct angle.  The radius should be about 2 1/2" - 2 = 3/4" and the tail length should be 1".    If the radius is too small, = the hammer will check too high on the tail.  If the radius is too long, = the edge of the tail will hit the check first and eventually cut a small = ledge in the leather and you will get bouncing instead of checking.  The = back of the backcheck should be parallel to the hammer moulding with the hammer at rest.  When you put the hammer in check, you should be able to push = the hammer downward into the backcheck with your finger, but you should feel = the resistance increase the further you go.  If you can push the hammer = straight through, the backcheck is too upright, if you encounter = immediate resistance then the angle is too flat and you will get "hard checking" = (or not checking), i.e. you will feel it in your fingers at the = key.  When the angle and radius are correct (and assuming the leather is in good = condition) you will not need to rough the tails.  It just eats up the leather that = much quicker.</FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>David Love</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=rogerio.cunha@terra.com.br href="mailto:rogerio.cunha@terra.com.br">Rogerio Cunha</A> </DIV> <DIV style="FONT: 10pt arial"><B>To:</B> <A = title=pianotech@ptg.org href="mailto:pianotech@ptg.org">Pianotech Mensagem</A> </DIV> <DIV style="FONT: 10pt arial"><B>Sent:</B> September 24, 2002 1:38 = PM</DIV> <DIV style="FONT: 10pt arial"><B>Subject:</B> HELP</DIV> <DIV><BR></DIV> <DIV><FONT face=Arial size=2>To the list</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>After to use the Spurlock's Grand = Hammer Tail Arcing Jig, the tail of the hammer becomes very smooth and this makes difficult the backcheck. There no difference if you use sandpaper = 60 or 120 to do the arc. The tail always is smooth.</FONT></DIV> <DIV><FONT face=Arial size=2>What is the best and easy way in = order to scrape the tail?</FONT></DIV> <DIV><FONT face=Arial size=2>Thanks to all</FONT></DIV> <DIV><FONT face=Arial size=2></FONT> </DIV> <DIV><FONT face=Arial size=2>Rogerio Cunha<BR>IC Member of The = Piano Technicians Guild<BR>Rio de Janeiro - Brasil<BR><A = href="http://planeta.terra.com.br/arte/dacapo/">http://planeta.terra.co= m.br/arte/dacapo/</A><BR><A = href="http://www.perfectpitch.hpg.ig.com.br">http://www.perfectpitch.hp= g.ig.com.br</A></FONT></DIV></BLOCKQUOTE></BODY></HTML>