[12 piece bucket]

Helpful 12PB!! but accurate I guess...

The 2 options in the real world are :-

- backswing either rotated shoulder turn (90 degrees to spine) or flat shoulder turn (to postion right shoulder on plane)...

- downswing - both of the above should have "on plane" shoulder turn.

If that is correct...it begs the question what are the differences in the backswing...which components go with which etc...

There is some line about rotated shoulder turn achieving same plane as flat shoulder turn at top/end...but it all depends on waist bend or something...

If waist bend is key then that is all knees and hips...like 12PB said...

Need some wisdom to understand how it works together...not me sadly...

Generally I think it has lots to do with the selected plane angle. Mr. Kelley said that he thought about naming the book Plane Golf. So the components must comply with the plane and hand path. Generally I'd say the steeper the plane the flatter the shoulder turn and vicey versy. So the more up the hands go generally the shoulder plane is going to be flatter and the more "deep" they go the shoulder turn will be steeper.