[O.B.Left]

OB left

You are correct that the TGM pivot axis (which is apparently a vertical line centralised between the feet while going through the base of the neck) is different to VJ's pivot axis.
Jeff.

Hey Jeff

Actually what I said was vj's "axis of rotation", TGMs "pivot center".

TGM's "pivot center" as defined in the glossary is: "SOME POINT on the body kept stationary throughout the Stroke, to stabilize the motion". CAPS BY ME.

VJ's axis of rotation for full shots is around the left foot. I dont have my Vj book with me but the two seem not to be mutually exclusive. VJ , if memory serves me correctly advocates shifting the hips, axis tilt, to align COG with his "axis of rotation" all the while holding the "pivot center" in place to stabilize the motion.

I may be wrong but assuming the head is not the pivot center the heads weight will have to be counterbalanced to avoid a wobble about the axis of rotation. No?

OK, now for the incubator stuff: Is this counterbalancing sort of like a fly wheel? Is there is a mechanical advantage to the counterbalance? Like in Leonardo's Flywheel. Click on the link and watch it go with just a flick of the hand.

http://commons.wikimedia.org/wiki/Fi...o-Flywheel.ogg

Jeff, perhaps your objection to the pivot center definition would change with MORE thought given to it not being the head but rather the base of the neck or somewhere there abouts? The head with all of its weight counter balancing the mass on the other side of the axis of rotation like in Leonardo's flywheel? Perhaps you could do a drawing? The head's weight is considerable and would take a substantial amount of body or hip to offset it. An optical illusion of sorts when trying to perceive a pivot center and axis of rotation.

Im obviously out on a incubatorial limb here. Heck, just grip it and rip it.

OB.