Assuming the 'Left Wrist Vertical to the ground at Low Point' procedure, the Ball Location will be at Low Point, and the Shaft will be vertical, regardless of the selected Hinge Action.
Yoda - I've never understood the "Wrist Vertical to the ground at Low Point' procedure" to mean the ball had to be positioned at low point. I believed it to mean that if the ball is located before low point, the left wrist would not yet be vertical to the ground (because you are not yet at low point), but it would still be vertical to its basic plane. It would then continue its hinging motion until it became vertical to the ground at low point.
A concise and intelligent answer to this question requires that readers have an in-depth knowledge of TGM. Ideally, I'd also be able to demonstrate. Otherwise, this question is impossible. I know, I've just tried several times! It is simply too advanced and requires too much supporting conceptual information. So, with apologies to the many, here we go with a reasonably complete answer to the few.
The theory of Hinge Action dictates that Low Point is directly opposite the hinge pin. It is thus the only place where the Flat Left Wrist is Vertical to the ground for all three Hinge Actions. Hinge Action by definition is in operation from Impact to the end of the Follow-Through. So, Hinge Action is an Impact Concept. With the Ball positioned at Low Point and the Grip taken in the precision Flat, Level and Vertical Impact Alignment, the Left Wrist is, by geometrical coincidence, simultaneously Vertical to each of the Three Basic Planes, i.e., Horizontal, Angled and Vertical. And that was the basis of my post. The Left Arm, the Clubshaft, the Ball and the Flat Left Wrist are all in the same Plane -- the plane of the Left Arm Flying Wedge -- and the Left Wrist is simultaneously vertical to the ground for all three Hinge Actions.
But...Low Point is the most difficult of all Ball Locations from which to play. Virtually all Clubs are manufactured to produce a Straightaway Flight with a Ball positioned well back of Low Point. Nevertheless, it is desirable to maintain as many 'samenesses' as possible for all Golf Strokes. And the most important sameness of all is the Flat, Level and Vertical Left Wrist Impact Alignment. Unfortunately, unlike the Low Point Impact Ball Location, only Horizontal Hinging has the Left Wrist Vertical to the ground for all other Ball Locations. To maintain the Left Wrist Vertical to the Ground for Vertical and Angled Hinge Action, the Clubface must be adjusted.
The 'Vertical to the ground at Low Point' procedure has certain practical applications. For example, avoiding the 'bouncing' of the Clubhead into the Ball when playing off hardpan. Also, using a 'Reverse Loft' Putter to produce a true Overspin. Aside from these and other exceptional cases, the "precision [Hinge] position per 2-G" (7-10) is best considered a theoretical concept.
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