<!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 5.50.4522.1800" name=GENERATOR> <STYLE></STYLE> </HEAD> <BODY bgColor=#ffffff> <DIV><FONT size=2>I notice, when I am doing a weigh-off on a key = board, that on some actions as the hammer rises the acceleration is relatively = slow and steady.  Other times, once the hammer starts to rise, the = acceleration is quite rapid.   What is responsible for that = difference?  Friction would seem to be the logical answer, but friction where?  = I heavily lubricate actions before I do a weigh-off.  There seems to = be something else at work in the geometry/leverage.  Among other = things, with the rapidly accelerating hammer, it is more difficult to determine the measured downweight.  I there any way around that = problem?  </FONT></DIV> <DIV><FONT size=2></FONT> </DIV> <DIV><FONT size=2>David Love</FONT></DIV></BODY></HTML>