What was Homer Kelley's 'almost' Fourth Imperative?
Rhythm.
The Left Arm Flying Wedge -- the Sweet Spot Pull and Clubshaft (the Invisible and the Visible), the Left Wrist and Left Arm -- all going around the Left Shoulder Hinge Pin together (the same RPM).
And the Right Forearm Flying Wedge -- actuated Muscularly (Hitting -- Right Arm Drive-out Action) or Centrifugally (Swinging -- Left Arm Throw-out Action) -- closes the Left Arm Flying Wedge 'door'.
Either Way, drag your wet mop though Impact.
Extensor Action with its Checkrein control of the Right Elbow is an essential ingredient.