According to TGM teaching it cannot possibly be the right arm. Pulling an arrow out of a quiver is a mental concept for swingers, and a swinger pulls the grip end of the club along its longitudinal axis with his left hand. The right arm/forearm can only apply pressure to the left thumb at PP#1, and cannot directly pull on the club. The right hand can sense clubhead lag pressure at PP#3, but it doesn't apply any active force at PP#3.
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