Because it is anatomically impossible to get the left hand "back and up" there (top of the backswing) with out some rotation, the face fans open on the way up and closes again on the way back down. (And it is unfortunate that the process is likely not anywhere near as precise as with a set of high quality gears... ala iron byron). This has nothing to to with angular momentum vectors axis of rotation or lathe imbalance forces either.
So, regarding your "beautiful theory", are you suggesting that the rate of closing is always constant in the Downstroke?
Instead of having "nothing" to do with Angular Momentum, would a delay in the closing have something to do with Angular Momentum and/or an axis of rotation?
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