Prior to 1992 the action spread was 112.5 mm. With the shank horizontal, that would be theoretical string height. Subtract your l/o distance from that. Just for fun, assume your string height as derived above. Measure hammer center height measure hammer blow Hammer Center Height + Hammer Blow = String Height By manipulating this equation you can ascertain whether the brackets require a shim underneath. Don't do much key leveling/dip work out of the piano. Regards, Jon Page, piano technician Harwich Port, Cape Cod, Mass. mailto:jonpage@comcast.net ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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