[Daryl]

You raise an interesting question. The "vertical" of Hinge Action's left hand to the associated Basic Plane alignment. D, do you thinks it's a "geometrically" vertical thing again as opposed to literally vertical? Sorta like geometrically flat ? I think it must be to encompass the turned left hand grip types. From not turned all the way to the fully turned 10-2-D.

How can I describe this better? Say you had a turned left hand grip , turned any amount and you held a ping pong paddle like wise, with the paddles face vertical to the ground . To Hinge properly the paddle would maintain the vertical to the basic plane alignment despite the fact the hand is turned. The hands condition thus being considered "geometrically" vertical though not literally vertical.

Uh maybe I just made it worse with that attempt.

I understand, and it's an interesting comparison. But the Flat Left Wrist is the Flat Left Wrist. If it's Bent or Arched then you sacrifice Rhythm to the extent of it's Bent or Arched condition.

Turning the Left Hand to the Top of the Shaft (10-2-D), you substitute Bending and Arching for Cocking and Uncocking and Visa Versa. The Left Arm Wedge is aligned at 0 degrees (its On Plane at Impact). You'll need to Unbend the Right Wrist because its on the same Plane as the Uncocking Left Wrist. Controlled Throwaway.

While the Right Forearm seeks its Angle of Approach for Impact, it is the responsibility of the Right Forearm Wedge, to return the Left Wrist to whatever Alignments assigned to it at Impact Fix. When the Wedges are Aligned at 90 degrees, it's the function of the Right Forearm Wedge to return the Left Wrist to Vertical, Level and Flat for Impact. It has no choice; it can only do that, it's aligned for that, it exists for that, regardless of Hinge Action. Extensor Action gives the Right Forearm Wedge this control.

Except when using the Elbow Plane, the Right Forearm Wedge is Only On-Plane (Aligned to the Swing Plane) for the Impact Interval unless the Right Shoulder is On-Plane and then, from Impact to Follow-through.

Of course, without Extensor Action you may get as far as a Tour Player. Doomed. Always worried if you'll have your "A" swing today. Always eating someone else's food, driving someone else's car, playing someone else's clubs. Always leaving. Always looking for another trick.

As Amateurs, we can rise above that.