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I think there is a correlation between extensor action and where its applied either in pp3 or pp1 and the no.2 accumulator.
Because the stretch is always below plane - towards the plane line. It is my belief at this time that if you solely apply extensor action and trace with pp3 with that pressure always going towards the plane line, that acc no.2 never gets fully loaded which is fine for some shots such as a chip. Inorder to load no.2 the extensor action must be applied by no.1.
It is just my interpretation and it may not be correct. I believe in it almost blends in to one another depending on the loading - In my own stroke I try to start-up with no.3 applies the pressure towards the plane line and right towards the end of the backstroke, it switches to no.1 as my left wrist cocks - snap loading the power package.... If I was doing a full sweep this would happen alot sooner in the backstroke.....
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