Yes RE the Action Analysis paper. Years ago someone put me onto this. Been through it with a fine tooth comb; ran all the numbers, every single formula, added drawings and spreadsheets, and cross-referenced critical sections of it with my own work, and verified everything to my own satisfaction. The paper is well done. I hold a few minor differences in how Mr. Mallory set things up; but in terms of approach, grasp of the subject matter and follow through (along with a broader grasp of physics and mathematics), this is fine work. Nick <div class="gmail_quote">On Wed, Sep 19, 2012 at 6:38 PM, Brown, David <<a href="mailto:dcbrown@mail.smu.edu" target="_blank">dcbrown@mail.smu.edu</a>> wrote: I wonder if you ( or anyone ) had read this analysis- <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> <a href="http://pianobytes.com/ActionAnalysisinertiaa.htm" target="_blank">http://pianobytes.com/ActionAnalysisinertiaa.htm</a> Best- DB David C. Brown RPT Piano Technician Division of Music Meadows School of the Arts Southern Methodist University Dallas Texas <a href="tel:1-214-768-3976" value="+12147683976">1-214-768-3976</a> </blockquote></div> -- Nick Gravagne, RPT AST Mechanical Engineering