[Etzwane]

The way I explain McKenzie's results in every terms is that as the club is set (at transition) under the plane where the hands will move, the dragging from the hand will tend to move it back to the plane. This produces the supination of the left forearm and, if everything is time perfectly, the squaring of the clubface.

It's a nice result but from a model of the golfer/golfswing that is still simplistic in a way. We have the compute power to deal with more realistic models but this needs of course people to figure out the models. It would also be nice to check from the model how much margin of error there is in relying on a pure passive squaring of the face.