[sasquatch_mn]

Hold the backswing halfway up and then grap the Clubhead with the Right Hand. Then keep PULLING the club DOWNWARD, OUTWARD and FORWARD (the "Intent/Cause") with a straight Left Arm (powered by shoulder rotation or/and left arm action) slightly before (so that you can Load it with some "LAG") letting go the Right Hand.

You will clearly see and feel (without the involvement of the right side) how the Club(head), the Clubface, the Left Wrist, the Left Arm, ... do exactly what they are supposed to do (the "Effect") (at least for "Swinging"), at least geometrically.

For your regular (Swinging) swing, the Right side is supposed not to disrupt , but reinforce , that Motion and Action.

Im really struggling w/ this left arm right arm swing concept. Specifically for me, I think i understand the feeling of swinging w/ left arm. Left arm only drills and what that does for you pivot...Where it gets grey is right arms role then...specifically how the the pitch elbow and extensor action fit into this. Is extensor action another way of saying as you stated "right arm role of reinforcing"?. If right arm is passive how do you provide structure of pitch elbow and extensor action?