By the way, compare the Geometric theory (the cardboard model in Post #12) with its demonstrated Equivalent (Ted Fort's avatar...his Left Arm and Club per Post #13 or elsewhere).
" The training was rooted in the precision alignments of the Mechanical Checklist For All Strokes (12-3) and the Twelve Sections of the Stroke (Chapter Eight). We would first learn to identify the boundaries of each Section -- Students would call out the name as they moved to it ("Start Up"..."Backstroke"..."Top," etc.) -- and then pose for ten seconds in each, monitoring the Alignments as I called them out. We also worked hard on the three-step Address Routine of 3-F-5. Over a period of three days, these alignments became more and more habitual, and students learned to both train and check themselves. We moved from Posed Positions to very Slow Motion Strokes through the Positions to Normal Speed Strokes. Much of this was done first with a ClubSHAFT only and only later with a real Club. And always without a Ball (except as a reference point to Swing through!)."
Yoda, is it possible to recreate this learning 'process'(or a detail of it) demonstrated in a downloadable gallery video? With you identifying "the precision alignments of the Mechanical Checklist For All Strokes (12-3) and the Twelve Sections of the Stroke (Chapter Eight)."
Moving from the posed positions to a slow motion stroke would 'cut to the chase'or essence more than anything else I can imagine.
These old photos are classic reinforcement of TGM principles unaltered by fad or latest trends.