Letting the body pivot, per the MacDonald drills, as a result of the right forearm takeaway
Remember, everybody, the Body (Zone 1 / Pivot) has its assignments. As do the Arms (Zone 2 / Power) and the Hands (Zone 3 / Purpose).
Each Zone must execute its assignments irrespective of the others.
In a Hand-Controlled Pivot, the Right Forearm keeps the Clubshaft On Plane in Start Up as the Body Turns and generates the circular motion of the Stroke.