[dclaryjr]

Good stuff. But I'm wondering why he doesn't differentiate between the 'standard' flail and the 'golfer's' flail. Piece of string vs. hinge pin?

The 'standard' flail as Tomasello demonstrates allows the 'clubhead' to pass the hands. The 'golfer's' flail has a hinge pin that only permits cocking and rotating and doesn't allow a bent left wrist.

I think the demonstration is valid. The "clubhead" could pass the hands if the pivot motion is interrupted. That's what would happen with a real club and real human wrists. The hands are still leading and the in-line condition of the lever is achieved.