[Jeff]

Yoda - I got stuck trying to draw those lines.

I have lost confidence in my ability to accurately locate the upper swing center.

I can see the right shoulder. Now, I have to mentally "picture" where the left shoulder is located - which depends on the degree of shoulder rotation and the angle of the shoulder turn relative to the ground. I cannot clearly "picture" where the left shoulder is located in this birds-eye view where the upper torso is so spiraled. Can you offer any advice?

Jeff.