I don't recall the section off the top of my head, but I'm surprised this conversation hasn't gotten back around to the straightening right arm and its effect(s) on clubHEAD and RPM/rate of closing.
A properly straightening right arm (motion/direction) and elbow location, prevents any 'early roll' before both the both arms straight position and helps ensure hinge action stays perpendicular to its associated plane.
Im not sure if I quite agree with you Edz, this is something which only recently i've really gotten into my head even though intellectually I knew it before.
The right arms role is to merely stretch out pp3 with extensor action(the stretch), right forearm pickup(the movement), and 'lock in' the plane by tracing its baseline (the point of that stretch) unless your hitting in which case the right arm also powers the downstroke(the movement). Remember hitting or swinging it is always a left arm stroke. The right arm allows control of certain alignments - as the right forearm traces back the plane line it controls the secondary hinge (the one that lifts the arm up and down) and cocking of the left wrist per the magic of the right forearm... it maintains its own impact alignment (right flying wedge) by pushing pp3 going towards the line. However the hinge action of the left arm staying flat on the primary hinge and its swivel joint turning and rolling whilst the left arm makes its motion against that hinge powered either by the pivot or right forearm creating a pressure against it(hint to those that think theres something called right arm swinging - its not happening ever ever!) is entirely a job for the left arm alone to monitor, it is not the right arms job to get involved with trying to monitoring it.
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