<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=iso-8859-1" = http-equiv=Content-Type> <META content="MSHTML 5.00.3013.2600" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT face="Californian FB">To the list</FONT></DIV> <DIV> </DIV> <DIV><FONT face="Californian FB">There are very good articles and = discussions about the position of the jack under the knuckle in a grand, but there = is no discussion about the position of the jack under the hammer butt in a = upright piano.</FONT></DIV> <DIV><FONT face="Californian FB">I would like to know the correct = thickness of the butt felt that must be applied in a piano. I think that "medium" and = "thin" isn't good.</FONT></DIV> <DIV><FONT face="Californian FB"> I thanks to all</FONT></DIV> <DIV><FONT face="Californian FB">Rogerio Cunha<BR>IC Member of the = Piano Technicians Guild<BR>Rio de Janeiro - Brazil</FONT></DIV></BODY></HTML>