[comdpa]

Come on man, I knew that... so back to the question. If you make a shift in the downstroke, which plane is the preselected Downstroke CLubshaft Plane, that the shoulder should move precisely on? The plane your shifting from or to? Or is there no preselected Downstroke Clubshaft Plane if there are shifts in the downstroke?

I'm going to assume your talking about the clubshaft here, coz I definitely can't picture the rear shoulder getting down to the elbow plane Should the rear shoulder make plane shifts during the Downstroke? If the rear shoulder is on the Turned Shoulder Plane at startdown, no matter what shoulder turn was used, how can it move downplane at startdown on anything but the Turned Shoulder Plane?

So how do I know how far I need to keep the shoulder on plane for? If it's an individual thing, I guess trial and error is the way to go? How do I know if my bad shots are due to not keeping the shoulder on plane far enough or something else?

My apologies "nevermind"...

I read your question wrongly and thus came up with a wrong answer. We are on the wrong pages.

You were referencing "shoulders" only and I referenced at times "shoulders" and "clubshaft".

When I referred to "shifts" I was referring to "plane angle shifts". Per 10-6-B, "any Plane Angle Shift is very hazardous"

You are asking which "clubshaft plane" that the "shoulders" should move on.

Per 7-13 "When the Shoulder moves on the same Downstroke Plane as the Hands it provides its greatest support and its best guidance to the stroke."

This would be the "Turned Shoulder Plane" 10-6-B, "which has far better performance characteristics than any other".

And it may not be the answer you want.

Per 7-13, a tip-off to bad shots created by improper shoulder motion is the non-existence of a "followthrough" 8-11