The dip doesn't have to be exactly 10mm, you know... you can just divide... But to keep everyone's measurements in the ballpark, it should be *about* 10mm. So punching compression can be eliminated. Just immobilize the key until you've done both measurements. --Cy-- Cy Shuster, RPT Albuquerque, NM www.shusterpiano.com www.facebook.com/shusterpiano
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