[tongzilla]

Chris,
I see your issue, I'm sure you've been praying for someone to understand your analysis .

The "left wrist on-plane" is a very general term- as I've seen it used. As you correctly determined- say at the top of a typical golf swing- a flat left wrist is certainly not on plane if it is flat- then it's on the same plane as the left arm- which is not on plane.

Could the left wrist be precisely on plane somewhere during the backstroke or downstroke- it could but I really wouldn't think it would be worth noting.

This is why I think Left Hand Turned facing toward the plane is different to Left Hand Turned On Plane. Like Chris mentioned, if the Left Palm was turned directly On Plane with a Flat Left Wrist, the the Left Arm would also be On Plane, but looking at photos of Diane and touring pros, it never is!

Yoda said:
"When Turned...the left palm faces directly toward that [selected] Plane."

I believe this can be misleading if you're not careful given my comments above. Hence my question at the beginning of this thread about how much exactly should the Left Wrist be Turned. Now coming to think about it, I don't think it's an important question -- as long as the Left Wrist is Turned so that it's generally facing toward the Plane -- it's fine!

I wonder what Yoda thinks .

[I have edited my post above after this insight]