I believe that the hinge action is not just a concept of through the ball (impact to followthrough) but also the motion of the entire left arm through the entire stroke (I would love Lynns input on this to know if I'm correct on this). Looking at the structure of the flail in 2k and when that flail is attached to the hinge arrangement in 1-L - the back of the upper arm stays flat on the hinge as the forearm or swivel goes from its vertical condition to a turned condition yet the upper arm is still vertical to its hinge action plane - on the downstroke you turn the hand back to its vertical condition for impact to align the clubface back to its impact condition and the motion of the entire left arm that hits the ball as if it where one big hockey stick...lol. Another reason I think this is because it is a component meaning it is 'a part' of a mechanical complex.
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