Thanks Bagger, never thought about that left wrist, right elbow relationship till now. Hmmmm. Standard Wrist action vs Single having different associated right elbow positions etc etc.
Think of the inverse of the paddlewheel motion of the right forearm and then you'll see both clearly. The straightening right elbow helps power the left wrist roll, and vice versa.
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Bagger
1-H "Because of questions of all kinds, reams of additional detail must be made available - but separately, and probably endlessly." Homer Kelly