David, You want the 15 gram gauge for flange centers. It is a great tool. The 100 gram gauge would be for measuring spring strength like vertical hammer or damper, but I don't own one of the 100 gram gauges so I cannot say much about its uses. Bruce Dornfeld, RPT bdornfeld at earthlink.net 847-498-0379 -------------- next part -------------- An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/20080302/f7b3dd72/attachment.html
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