Left arm wedge

[BerntR]

Bernt,
Are you a lefty! We don't allow lefties here! Just kidding- so following the context of the thread- anywhere in your post where you said right arm - I'm putting in left arm.
Thanks,
Mike O.

Further, that was my initial thought - that the left arm could be on plane at one point (parallel to the ground)- but in a normal golf swing it never is on plane (with the exception of a zero #3 accumulator).

Because the left arm starts at address steeper than the plane and then at the top is flatter than the plane does not mean that somewhere in between it is on plane. You'll see or verify that with any swing sequence where the left arm is parallel to the ground and the left shoulder is no where near on-plane.

You're right. I'm a lefty. Usually I manage to write stuff like this in a right hand perspective. But this time I messed things up. I've done some editing.

I will not argue against your last paragraph - about the left shoulder being above the plane when the left arm is parallell. If that is correct, it does have consequences to one of the premises I wrote:

2) the club (not only the clubhead) is on plane from impact fix to impact

Then this premise cannot be correct. If the shoulder is above the swing plane so is the grip with the left hand. Can the right hand with pp1 and pp3 still be on plane? I doubt it.

ThenIf the sweetspot is on plane and the hands above plane, the shaft angle must be flatter than the swing plane in this position.

There are more "ThenIf's" down this line.

Depending on how this thread is continuing, I might actually learn something very fundamental.