[Matt]

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.