[Daryl]

Thank for the reply Kev, but if I may, I have a follow up question. Is the parallel plane theory in the yellow book? Is it explained but not what Yoda teaches or is it just not in the TGM at all? I am asking becasue I thought that TGM covered everything? If that is the case, the nthis will only bolster my belief that TGM is best thing I can think of in terms of a golf swing.
I am genuinely confused and would apprecaited any direction or input.
Thanks

Rest assured Scottcuban. Hank Haney's procedure is allowed for and included in TGM. See the quote below, paragraph 2, last sentence.

Keepin mind that for every procedure, there is an intended purpose and unintended consequences. If you adopt a procedure for your swing, and think that the intended purpose is other than it's actual function, then the unintended consequences will probably need compensations to allow it to function to meet the actual function of the component.

7-7 PLANE ANGLE VARIATIONS Due to personal preference, natural inclination of the pressure of conditions it is not always possible or advisable to adhere to a single Inclined Plane classification throughout the entire Stroke. Players often – consciously or subconsciously – employ more than one of the “natural” Planes. The Shoulder Planes are the more consciously employed – the Elbow Plane the more – almost totally – subconsciously used. Vaguely or incorrectly defined Planes and Variations must be eliminated. The list is restricted to those of fairly common usage – good and bad. Other than the Right Shoulder positions, only the Elbow reference point has any great general usefulness. The “Hand Angle” is emergency or special purpose application. Wrist Action and the selected Inclined Plane must be compatible – watch especially with “No Wristcock” Strokes.

During any Shift of Planes the Clubshaft is held On Plane with the Plane Line as though the Plane itself were moving to the new location. Other controlled procedures that achieve On Plane Impact may be more difficult but need not be deemed improper. Such as positioning the Clubshaft at The Top of the Plane Angle intended for Release. And study 2-N.

Always view the Plane as rectangular (with four ninety degree corners), so, depending on the terrain and the situation at hand, the lower edge may be downhill, uphill, level, partially underground or above ground but always with both Plane Lines (Impact and Low Point) parallel to the upper and lower edges. But tilted, rotated or whatever, always have an Inclined Plane and a straight Plane Line. Remember, you must always adjust the Plane Angle and the Ball Position to bring the Right Forearm positioning into agreement with the intended purpose – the one Forearm MUST represent both Alignments. Also study 2-J-1 and 2-J-3 in this connection.

The above underline by Daryl.