[Yoda]

Yoda

The 18" wide clubhead was obviously not intended to be a realistic design goal.

Thank God.

It was only created as an "idea" to get across certain concepts - that if Anthony Kim (or any other golfer) swings perfectly on-plane (per Homer's definition of an on-plane swing) and gets to the elbow plane by the 3rd parallel, then he is going to be staying on the elbow plane between the 3rd and 4th parallels.

Jeff, you're missing the whole point. Assuming the Elbow Plane through Impact, the Elbow is indeed 'in Plane', but . . . with what? The answer is: the Sweetspot, and not the Clubshaft. The Clubshaft (the visible) is a close enough representation of the Sweetspot's Centrifugal Line of Pull (the invisible), but it is not quite as precise as some demand. Knowing you were coming (but still didn't quite yet get it), Homer Kelley added this sentence to 2-F:

"So, there is a Clubshaft Plane, and a Sweetspot, or Swing Plane. But, herein, unless otherwise noted, Plane Angle and Plane Line always refer to the Center of Gravity [Sweetspot] application."

You would have the good Mr. Kim held hostage to the Shaft's original Angle of Inclination, yet you move the Sweetspot NINE inches outside the original Plane of Motion. That, sir, is not only bad science, it's downright goofy. Apologies in advance if you consider that last sentence an "ad hominem' attack.

I also think that he is going to have the "feeling" that the sweetspot rotates to the clubshaft plane post-impact (X rotates to B) and there will never be a "feeling" of the hosel leaving the elbow plane post-impact and rotating around the sweetspot.

Whatever. I make no claim as to what other golfers feel. But, I do know that when David slew Goliath, the sling got in line with the rock, not the other way around.

I am not at all convinced that a golfer who mentally thinks of an orbiting sweetspot, but still swings on-plane to the elbow plane by the 3rd parallel (like Anthony Kim), will generate a different clubshaft/clubhead arc of movement than Anthony Kim.

A question posed by yourself, considered by yourself, and answered by yourself. Yet you remain unconvinced. Why?

A question - the baseline of the sweetspot plane must exist outside the baseline of the clubshaft plane. During which part of the swing is the golfer tracing the sweetspot plane (aiming at the sweetspot plane)?

All parts. Per 1-L #6, "The [Sweetspot (which replaces the Clubshaft per 2-F)] always the points at the Plane Line except when they are parallel to each other". And what is the golfer's means of tracing the Sweetspot Plane Line? Lag Pressure. Ya gotta ditch this preoccupation with the Clubshaft, Jeff. It's killin' ya.

Can a golfer practice tracing a SPL with a dowel stick, which doesn't have a clubhead and a rotating sweetspot that is a finite distance away from the longitudinal axis of the shaft in the impact zone?

Of course: Just point the dowel at the Sweetspot Plane Line (normally, the Target Line).