I just read this very interesting thread from long ago. This may be slightly off the original topic but can I ask you a few questions regarding the vertical plane of the left hand cocking and un cocking and the associated club face alignment.
-When hammering in a truly vertical manner does the club face stay vertical and parallel to the left forearm (assuming it was so aligned at the start)?
-When moving this vertical action to the inclined plane does not the club face stay similarly aligned to the back of the left forearm?
-If so then is the face not laying on the plane of the left arm rather than the turned shoulder plane or the hands plane?
I can see how the left hand bends to the shoulder plane as the player approaches top or end but am confused about the club face alignment in regard to the inclined plane at top or during release swivel or finish swivel too for that matter (back on topic)
Please re-read Post #64 above. It should answer your questions, or at least provide the clues you need to 'see' the correct alignments.
In The Golfing Machine, see also (1) the Left Wrist alignment in Photo 9-3-6 and (2) the respective Left Arm and Left Palm relationships to the Inclined Plane in Photo 10-6-B #2.
Remember, the Plane of the Left Arm Flying Wedge is the Vertical Plane of the Perpendicular Left Wristcock Motion (4-B-0/1/2/3). The Plane of the Clubshaft is the Inclined Plane of the Clubhead Orbit. These two are related, but . . . they are not the same.