[EdZ]

You're on the right track, KnightT. However, I suggest you modify your drawing to include a little #3 Accumulator (Left Arm and Clubshaft Angle) in the Left Arm Wedge. Then, let that Angle illustrate the 'inverted' Wedge shape.

There still is a Left Arm Flying Wedge with Zero #3, but the 'Wedge' shape (the #3 Angle and Wristcock) itself has disappeared! Nevertheless, a basic illustration would not omit the identifying relationship.

As an 'outside the box' image - it can be useful to imagine the wedge with zero #3, as illustrated, regardless of the 'actual' #3 angle, zero or not

relate that image to the direction of extensor action, and delivery path tracing, and most importantly, to the plane PP#1 travels (fix location, top/end location and a spot on the ground straight down that 'imaginary' zero #3 line - for the sake of simplicity, straight down and extention of the left arm at address.

This allows you to 'trace' a line that is on the ground, parallel and between the stance line and the target line, where that extension of the left arm would intersect the ground, and use that line as your third point in the plane that PP#1 travels for a 'zero shift' motion.