Hey there Alan. That is exactly what I was thinking. Tho not getting any direct info about the studies.... one does have to hold back a bit :) That said... I agree... I think what Jim is referring to is a different matter then the shank resonance thingy Cheers RicB Ric, I think what Jim is referring to here is a study that Chris and Rick Baldassin did regarding flange pinning and hammer tone (using a spectrum analyzer), not flange pinning and shank resonant frequency. Alan -- Alan McCoy, RPT Eastern Washington University amccoy at mail.ewu.edu 509-359-4627
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