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.
The Flat left wrist or its EQUIVALENT defined. Colonel 12 Piece, herein lies the answer to the question I posed to you on more than one occassion: How can you have compliance to the Flying wedges with a 10-2-D grip? The Master has confirmed my theory perxactly!
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