Joe, You are correct, over strike is the hammer hitting the strings beyond perpendicular, under striking is short of perpendicular. It seems to me that the better angle for the hammer would be an initial slight under strike so that as the hammer wears the strike angle approaches perpendicular (playing in) and gradually over striking as it wears further. Instead of hitting perpendicularly initially and playing out from the beginning. On this piano, 75% of the string cut is on the top shoulder. How can this be beneficial. And why is there a difference in theory for strike angle between verticals and grands. I see many verticals with this over strike. -- Regards, Jon Page
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