"... Hinge Action is inseparable from Angular Motion..."
In my opinion, the quote above is the rationale -- the only rationale -- behind Hinge Action's new home in Zone #2.
In other words, Hinge Action is generated automatically by the physics of Angular Motion (2-K) -- Horizontal Hinge Action by the Throw-Out of Centrifugal Force and Angled Hinge Action by the Drive-Out of Muscular Thrust. Vertical Hinge Action is the byproduct of neither and hence is always a deliberate, mechanical manipulation.
Thus, Hinge Action executed by the Flat Left Wrist provides only a veneer control that "individualizes" Angular Motion's Clubhead Control into the three possible motions of the Clubface (Close only, Layback only and simultaneous Close and Layback). Which, also in my opinion, is why Hinge Action was a Zone #3 Component in the prior six editions: Zone #3 is all about "Clubface Control" -- "Accuracy" and "Direction" -- and is "mostly 'finesse' control" (9-2). Zone #2 is "Clubhead Control (Power)" and its "Power Components" (9-2).
So, this 'sea change' was a bold step, one that impacted many areas of the book. Its 'as is' inclusion in the seventh edition has now introduced many inconsistencies throughout the text that could have been -- and should have been -- resolved prior to publication. This is not 'Monday morning quarterbacking': It was one of the three primary concerns I voiced last winter http://www.lynnblakegolf.com/forum/s...1962#post21962. In addition to the integrating actions mentioned in that post, considerable conceptual and textual changes also are required in Chapter Nine (The Three Zones).
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