Ref 1: 6-B-3-0-1 "So-except in Sections 1 and 3 (Chapter eight) the entire Left Arm, the Clubshaft and the back of the Left Hand are ALWAYS positioned against the same flat plane-the plane of the Left Wristcock motion."
Ref 2: Gallery audio for John Reiger, day at the office-iron-"the left wrist works like a hammer" but, as I understand it, not in-line with the left arm plane.
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