[Mathew]

Still don't get it. Parallel? I would think that if the entire plane is parallel to another plane that all points on one plane would be the exact distance from a corresponding point directly across from the other plane- vertical to the plane surface. The accumulator #3 is closed to the swing plane so I don't see how they are parallel and didn't understand your explanation. As you said and agreed with me - the left arm goes into the swingplane at an angle- so I missed how that could be considered parallel. If a book is closed- then I would say that all the pages i.e. individual pages i.e. planes are parallel but if the book is opened up and all the pages are now angled outward from the spine- and "point" in different directions- then I wouldn't consider them parallel. I'm thinking you might be defining parallel differently? Can you restate it using an example unrelated to golf? My issue is to understand what you're saying then we can move forward to Annikan's comment- how do we use it or how does that understanding help us.

Ok another book cover example

Put your book against a wall so that when the book is open the books contents are facing the wall. As the two covers extend on to infinity and cut through this wall the lines of intersection will be parallel.

On a separate note- wristcock would not affect the #3 accumulator plane.

Incorrect.

This is one of the main reasons I showed this relationship. The longitudinal center of gravity is inline with the left wristcock motion which all occurs on the accumulator no.3 plane. Because the accumulator 3 plane is a left arm plane and goes through the inclined plane, accumulator 2 motion can never be seperated from the no.3 accumulator. The only way for them to be completely co-ordinate would be to bend the left wrist to the degree that the accumulator no.3 goes into the inclined plane. Hence so that the palm would actually be touching the plane rather than just turned directly towards it...

In this positional example the longitudinal center of gravity must be at exactly 90 degrees to the left arm so that it is on the line that the two planes intersect otherwise it would not be on plane. The left wristcock motion is a motion made on the accumulator no.3 plane not the inclined plane...