You wrote-: "MAYBE THEY THINK THEY ARE DOING THAT. BUT IF THEY ACTUALLY ARE ROTATING THE CLUBHEAD ABOUT THE HOSEL , THEY ARE IN FOR A SHANK".
I don't think that a golfer ever rotates the clubhead around the clubshaft axis. It only "feels" like it is happening when the golfer notes that the toe passes the heel in the followthrough.
What causes the clubface to close is simply the phenomenon of the flat left wrist/hand rotating in space. What causes this rotation?
Pre-impact, the release swivel action is due to external rotation of the left humerus within the left shoulder socket combined with a small amount of left forearm supinatory movement - all these biomechanical actions are passive and are merely the reversal of the rotary biomechanical actions that occurred in the backswing.
Post-impact, the flat left wrist/hand rotates around to the left due to a horizontal hinging action, which is biomechanically due to external rotation of the left humerus within the left shoulder socket while the left shoulder socket moves left/backwards due to continued torso rotation.
The clubface remains neutral relative to the left hand and it doesn't roll-over relative to the flat left wrist/hand because the left hand always firmly grips the club and never allows the clubshaft to rotate within the grasp of the left hand. The clubface simply rotates to exactly the same degree as the flat left wrist/hand rotates pre-impact and post-impact.
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