<!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html> <body bgcolor="#FFFFFF"> Hi  Bradley Reread this after your last post, and had a few comments. Number one, you are getting two basic types of response, one goes to how to fix things, and another goes to hide or distribute the errors. I think you probably understand that things never get perfect, but they can get pretty darn good. Of course the 1/8th inch difference in blow you mention below reflects a problem somewhere, and such a problem begs hunting down. Knuckles are as has been said by several, a good first place to look, but in the end there are several things that can cause or contribute to the cause of such a problem. One of the best diagnostics is a good solid routine for regulating in the first place. If you know certain things are  <<good>> as it were you can rule those out. I think that first getting all four whippen adjustments dead on will insure that you can be very certain that letoff and drop are as good as the action will allow. You have to get several other adjustments pretty close for this, but once thats as good as its going to get, then refining the rest in a methodical manner can be very revealing. Ending with the key dip final refinement allows you to both hide the smaller problems in probably the best place to hide them, and at the same time allow you several oportunities along the way to identify problems. Its also good to have in the back of your mind a few things we know about actions. BW and a known ratio can tell you whether you are looking at a ratio anomaly or not. Friction problems can be sometimes misleading as well, so knowing how to identify anomalies with either can be a big help. Its handy to know what you can rule out ahead of time.           "Bradley M. Snook" wrote: <blockquote TYPE=CITE><style></style> When I do concert level regulation, I try and get key dip, aftertouch, letoff, and blow distance as even as possible (in that order). As a general rule, I try to maintain evenness in aftertouch and key dip, which forces me to distribute the majority of the inaccuracies between the blow distance and the letoff. Every once in a while I come across a note where something in the action geometry is obviously wrong (e.g. to get everything else correct, the blow distance would need to be in excess of 1/8" higher/lower than the rest of the hammer line). What do I do to fix this problem?  Bradley M. Snook Graduate Student in Piano Technology (M.Mus) Rice University, Shepherd School of Music</blockquote> -- Richard Brekne RPT, N.P.T.F. UiB, Bergen, Norway <A HREF="mailto:rbrekne@broadpark.no">mailto:rbrekne@broadpark.no</A> <A HREF="http://home.broadpark.no/~rbrekne/ricmain.html">http://home.broadpark.no/~rbrekne/ricmain.html</A> <A HREF="http://www.hf.uib.no/grieg/personer/cv_RB.html">http://www.hf.uib.no/grieg/personer/cv_RB.html</A>   </body> </html>