Swivel vs. Horizontal Hinge

[Yoda]

If Hinge Action Control is required only from Impact to the end of Follow-through (7-10), would that mean the finish swivel would occur at the end of Follow-through instead of just after seperation?

Yes, Drew. The Follow-Through -- Both Arms Straight Position -- essentially completes the Acquired Motion (12-5-2). The Finish Swivel begins the Total Motion (12-5-3) and serves as the link between the two.

[MizunoJoe]

Hinge Action is Clubface motion in the Impact Interval, which ends at Separation. So the Swivel can begin there.