The key alignment is that the Clubshaft be 'in line' with the Left Arm. This assures the Rhythm of the Stroke, i.e., the Left Arm and Club are traveling at the same RPM throughout the Downstroke (6-B-3-0).
If the Left Wrist is placed on the Grip in a Vertical Condition, then the Flat Left Wrist at Impact assures compliance with the 'in line' Left Arm and Shaft requirement. It also affords a visual confirmation of that compliance (4-D-1).
However, if you have Turned your Left Wrist when taking the Grip, then that precise amount of Wrist Turn becomes Wrist Bend at Impact. Hence, you have lost the visual check afforded by the Flat Left Wrist. However, as long as the Clubshaft has not passed the in-line condition with the Left Arm, you have complied with the Law of the Flail (2-K-#2) and maintained Rhythm. This compliance -- despite its lack of a visual check -- is known as the Geometric Flat Left Wrist.
It is very satisfying to come back so soon after asking a question and having it answered... you guys are the best!
Yoda, a question concerning your answer... if I have effectively bent my wrist to grip the club haven't I violated one of the basics of G.O.L.F." If so what is the cost? I get that it is a "geometrical flat left wrist" but is there some cost associated with it and if so, how can I minimize it's effect?
Also does gripping the club vertically mean zero acuumulator #3 angle? Would a vertical left wrist be something I should take on learning? You can probably summize that I stregthened my grip years ago because of fundamental flaws in my swing anyhoo.
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