<HTML style="FONT-SIZE: x-small; FONT-FAMILY: MS Sans Serif"><HEAD> <META http-equiv=Content-Type content="text/html; charset=windows-1251"> <META content="MSHTML 6.00.2900.2995" name=GENERATOR></HEAD> <BODY> <P> <DIV> </DIV> <DIV> Can someone explain to me the relationship for an upright piano with regards<BR>to hammer shank length and hammer bore angle in the bass section.  It appears to<BR>me that the bore angle needs to change as the shank length changes, and also possibly<BR>the blow distance??   It's probably obvious that I am not completely clear on<BR>the effect of changing any of these dimensions, and how to determine what the hammer<BR>bore angle should be.   Is this simple enough to be answered here in an email, or<BR>can someone lead me to a good book on the subject??<BR>    Thanks much<BR>    Dave<BR></DIV> <DIV> </DIV> <DIV><A href="mailto:DavesPianotuning@earthlink.net">DavesPianotuning@earthlink.net</A></DIV> <DIV><A href="http://www.home.earthlink.net/~davespianotuning/">http://www.home.earthlink.net/~davespianotuning/</A></DIV> <DIV>858-776-2516</DIV> <DIV> </DIV> <P></P></BODY></HTML>