<!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 6.00.2900.2912" 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=role_document face=Arial color=#000000 size=2> <DIV>Hello List,</DIV> <DIV>It has been fascinating reading the posts on inertia, initially sparked off by my original posting on the Petrof action I am dealing with.  Unfortunately I still don't have any further clarification as to whether inertia is the problem.  I have been back to the piano and checked certain areas which I had not previously been able to do.  If I could reiterate, the situation is:-</DIV> <DIV> </DIV> <DIV>A Renner action in a 12 year old Petrof concert grand which feels heavy and tiring to pianists.</DIV> <DIV>The D/W  average is 48g and U/W average 28g. Action ratio around 5.5</DIV> <DIV>The regulation is not perfect but is good.</DIV> <DIV>The damper pick up point is right.</DIV> <DIV>The keys are not binding at the balance point or at the capstan.</DIV> <DIV>The key weighting goes from 3 half inch weights in the bass through a (curious) tenor octave of 4, then to 2 and 1.  Obviously, the positioning of weights is crucial but without photos I can only describe the positioning as not looking unusual in any way.</DIV> <DIV>I noticed that the whippens are the Renner design to take a helper spring.  I don't see evidence though, that a set of springs or looped flanges has been removed. They are usually just unhooked if a technician decides against them.</DIV> <DIV> </DIV> <DIV>So, given that friction does not appear to be a problem in the general feel of the action, what would be your next steps in solving the problem.</DIV> <DIV> </DIV> <DIV>ric</DIV> <DIV> </DIV> <DIV> </DIV></FONT></BODY></HTML>