Philly...
Hinge action has the feel of the entire Left arm flying wedge executing a hinge action around the Pin whilie controlling the Clubface Motion...whereas... swivel rotates the shaft around the sweetspot with the lower portion of the arm independent of the hinge action...When you come down ...I'll show you...
Hinge Action - Clubface...
Swivel - Shaft Rotation around Sweetspot
AS
I was just clarifying- I don't assume anyone is necessarily wrong- you might completely understand it and just post in a manner that doesn't imply that, or the reader(me) may not understand the context of the post, or be incorrect, etc. You'll have to clarify what you meant when you posted "Hinge Action - Clubface" and "Swivel - Shaft Rotation around Sweetspot". My issue was you were relating the Shaft Rotation around the Sweetspot (Longitudinal Center of Gravity) strictly with Swivel, as if it didn't happen outside of the Swivel, when in fact it's happening during the entire swing. That is, whenever there is any face/shaft rotation- in any degree- then that shaft rotation is rotating around the longitudinal center of gravity.
In regards to "are you really sure I'm wrong on this one???" I think the best way to answer that in any given situation is just to present, describe, and clarify your/our comments and see where we logically end up. After all, it's an opportunity to learn and that's the great thing about forums- so I would love to have you clarify what you were saying and I say that sincerely and not sarcastically.