[ But, in the act of extensor action - there is no 'pulling', it is an extending motion of the right arm...it is simply the right arm striving to become straight and in turn - stretches the left arm.
However, you could, especially during takeaway, stretch the shaft through pp#3 (which is actually a slight pushing motion via triceps) which also stretches the left arm - and therefore, from shoulder to hosel will form a straight line. This is structure.
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Per6-B-1-D, Extensor Action is always a below-plane Pull. This Pullstraightens ideally, the entire Primary Lever Assembly (both theLeft Arm and Clubshaft / 6-A-2) through Pressure Point #3. However, withthe less skillful player, this #3 Pressure Point Pull may induceClubhead Throwaway. In which case, the Extensor Action should be limited to astraightening of the Left Arm only (by Pulling on the Left Thumbthrough Pressure Point #1). In either event, the Extensor Action is alwaysa Pulling Action, never a Pushing Action.
You can't Pusha piece of string into a straight line.