Hi Dave, et al I think the thing to remember is that when it comes right down to it... nobody really knows jack diddly about the question you posed. And why should anyone ? We have a few facts we can place on the table, and a couple assumptions about material behavior... and thats it. For example... why do certain areas of a pinblock start developing loose jerky pins suddenly after say... 25 years of use ? The only answers around are just plain speculation. Ok... some of the speculation seems more reasonable then some other... but nobody can put any facts on the board that can yield an authoritative answer. The loose pin / false beat discussion you referred to is a perfect example of what can happen when folks begin to place too much weight on too little facts.. mixed with a too rudimentary understanding of relevant physics. The claim made about how false beats are caused by loose pins are so simple, contain at least two fundamental errors, and fail (for not to say refuses) to take into account the huge numbers of exceptions... that one simply has to step back and discard the idea as being far to incomplete at best. Especially when there is in fact a better explanation out there. A few hundred years ago <<everybody>> *KNEW* the world was flat. Not more then a hundred and fifty years ago <<everybody>> *KNEW* that Telelurgic currents were the cause of all many of localized phenomena... like the outbreak of Barsel fever in Germany... We <<KNEW>> we could never fly. Up to a few years ago we <<KNEW>> we could never leave the planet.... only Buddha knows what we will <<KNOW>> tomorrow. Cheers RicB
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