Have to correct an error in that last post. The below quote should read (D1-D2) / cos sin A, instead of (D1-D2) * cos sin A. The rest is correct me thinks. "That would be (D1 - D2) * cos sin A where D1 is the distance of the string to key bed, D2 is the distance between hammer shank center and key bed and A is the angle between the key bed and the string plane." Cheers RicB
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