A simple block of wood with an extension (mine is a machine screw) that lays across the keys and that depresses a key exactly 6 mm whereby you then measure the amount of hammer travel and divide that by six to give the action ratio. It's been posted several times on the list by Dale Erwin and others. I'll post some pictures if I can find one. David, Ah, yes. I do recall that now. BTW, thanks for the pics. Not sure why it's 6 mm, tho. Why not 5 mm, which is 1/2 of most key dips, (well sorta<G) Best, Joe Joe Garrett, R.P.T. Captain of the Tool Police Squares R I
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