Swingers, however, utilize three Pressure Points when using a Three Accumulator Stroke. Power Accumulator #4 (the Left Arm) is Loaded by the Pivot against Pressure Point #4 (where the Left Arm contacts the side), and this Drag Loading Action (10-19-C) Loads the Secondary Lever Assembly (the Clubshaft only) via the Left Wrist (6-H-0-F #5) through Pressure Point #2. However, this does not result in an active drive of the Clubshaft because Centrifugal Force alone powers the Club (10-11-0). This 'Passive Clubhead Lag' (10-11-0-2) -- the Clubshaft being Pulled lengthwise directly toward the Plane Line (6-C-2-A) -- sets up the Centrifugal chain reaction (6-M-1) that ultimately pulls the Clubhead into its In Line condition (6-C-0-4) of Full Extension (2-P).
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"Resisting the Backstroke motion" (7-19-1) is the Hitter's method of Loading the RightElbow to Drive (10-19-A) the entire Primary Lever Assembly (Left Arm and Club) from the Top (10-21-A). Should he choose to go to the End (10-21-C), he must resist the formidable tendency to then Accelerate the Clubshaft (only) Longitudinally (Pull it lengthwise as if a piece of string) rather than the entire Assembly Radially (Push it from behind as if an Axe Handle). Study 2-K and 7-23.
"Throwing the Club against the Lag Pressure Point" (7-19-3) with the Pivot is the Swinger's method of Loading the Left Wrist to Drag (10-19-C) the Secondary Lever Assembly (the Clubshaft only) from the Top or End (10-21-A/C).
For Full Strokes, Hitters may alternatively use a Downstroke Side Assembly Point (10-21-E). Or, a Downstroke Top Assembly Point (10-21-D) if the inclination toward Longitudinal Acceleration is properly Compensated. Swingers may alternatively use either procedure without concern for an improper Loading due to the chosen Assembly Point.
For Short Strokes, both Hitters and Swingers use the Side Assembly Point (10-21-B).
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It is Axis Tilt (accomplished with Hip Slide in the Start Down) -- not Clubface Manipulation -- that brings the 'Trail' Shoulder down and On Plane. In turn, it is this On Plane Trail Shoulder that gives the player sufficient 'Trail' Arm, i.e., Elbow Bend, to manifest an On Plane Trail Forearm at Impact. So, for the Trail Arm to be On Plane at Address, there must be Axis Tilt. In his book, Power Golf, Ben Hogan had this to say:
"At the address there is no straightening of the right elbow. In order that the right arm will be limp and the right elbow down, one must list slightly from the right side. By list I meant that the right shoulder must be dropped and the hips faced slightly to the left."
We are saying the same thing: In order that there be sufficient Elbow Bend for an On Plane Trail Forearm, the Shoulder must be down and back (On Plane). And that is a function of the Hip Turn (assuming a Slide and its Weight Shift). That is why you see all good players with their trail Forearms On Plane through Impact, even though those same Forearms may not have been On Plane at Address.