[Yoda]

It is how you set the hinge in the shoulder that rotates the whole left arm

nb 'new boy on the scene' the quality of this answer is highly questionable

I'm not qualified to comment on this. But I have difficulties seeing how the LEFT shoulder can do this alone. Most of the rotation happens in the two bones in the left forearm, affecting the left wrist I would think...but I think it is best if someone else could set the record straight.

As a concept to promote Clubface Control and its Mechanics . . .

The Left Shoulder Hinge Pin is theoretical.

The Left Wrist held Vertical to one of the Three Basic Planes is practical.

The two meet as Educated Hands and the Feels of Roll, No Roll and Reverse Roll.

Vive la Mechanics!

Vive la Feel!

Viva la forevermore the translation of the one to the other!