Glad we could provide some motivation! I was real unsure of just what to do as far as measuring the forces acting on our test models, since by the very act of measuring them you change them in alot of cases. I hope we're both successful. -Tony << OK, will do. Maybe, now that there's actually an application for this thing, I'll have some motivation for moving it "up the queue" a bit. That's always been the problem with that thing; it's an intriguing design calisthenic, but I haven't really had any practical use for it so it keeps yielding to other projects. I'll keep you posted. Dave >> -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics