RWH and I have shared a couple of emails, so let's go public!
Me -
I've been experimenting with body position related to putting.
This far I've settled on the right grip, accumulator use, and a combo pick/paw motion.
In terms of body position, the on-plane right forearm (in my case forearms) help determine body position.
But the amount of on-plane elbow bend can create a wide variance upper body bend from the hips.
That's where an assist from extensor action can help determine elbow location in putting.
I don't vary spine angle (straight or curved) much because I like to turn around a straight rod.
Homer discusses shoulder position in 2-M-3 under (Generators).
So I try to keep mine forward with a slight assist or check from the pecs just to get the position right.
Not hunched, but the shoulder blades are separated and relaxed.
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