[Mike O]

Yes. You use the angle of the left arm and from this you can keep drawing a 90 degree 3 more times to get the four corners of the plane. Only when you have this relation with the accumulator plane can you then define a truely vertical plane (Jens plane) to relate to both acc#3 plane and the inclined plane. When both these planes directly face each other by the left hand turning towards the inclined plane, they directly intersect each other on a straight line. Because they directly face each other they are parallel just in the same way the edges of the cover of a book are parallel when you open it up. This intersecting line in which the secondary lever assembly demands that wristcock be at exactly 90 degrees.



The clubshaft is very close to being onplane when it is turned however due to any hookface position needed, this might not actually be exactly the case. The sweetspot or the longitudinal center of gravity always stays in the accumulator no.3 plane and it is this that we reference....



Planes are always referenced as though they were the horizontal. Above the plane is a far more accurate description. The left arm does go into the inclined plane at an angle. And because accumulator no.3 plane is a left arm plane so does it....

They are parallel in the context if you have yet another plane (I'll have to name this one too) on the tangential line of the left arm angle vertically through accumulator 3 plane, the intersecting lines of the inclined plane and acc no.3 plane will be on a parallel angle when moved in a parallel direction away from the tangential line along the line of Jens plane.

The plane shift variations question is out of context.

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.

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

While the left arm and clubshaft have the possibility of forming a 90 degree angle- that's because you start with some #3 accumulator - becuase the wrist cannot cock 90 degrees. So it's not 90 degrees of wristcock- minor clarification, I believe I understand you were just referring to the left arm - clubshaft relationship- but again since that angle has no influence on changing the #3 accumulator plane- not sure why it plays a factor in your analysis?

As I would say to Bucket- Bring it! The information that is.