[KOC]

KOC's first sentence is also correct, but not as precise. The shoulder cannot go down the clubshaft plane. However, the aft elbow can, thus setting up the the IMPACT-fix of one of the flying wedges.

Depending on one's focus most golf strokes are compensations!!

Thanks! "the shoulder down the shaft plane" is quoted from the preface of the book, 7th edition as my froum's signature.