> Ed, interesting that the hole in the half round moved in > later years; I didn't know that it ever was off-center. An > off-center hole would certainly change the ratio during the > key stroke. > > Vladan Actually, it wouldn't. Look at the difference between a half round dowel, and a flat punching. The ratio changes much more dramatically with the flat punching if the punching is at a level of half key stroke. With the half round, the ratio is very nearly constant throughout the stroke. Ron N
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