Can you explain more about the "loading at 90 degrees to the primary lever assembly"? I've never paid much attention to the angle before and I don't think I know what reference plane the 90 degrees relates to. Is it 90 deg to the basic plane being used?
CG
Imagine a child on a swing. When you push them, you do it from directly behind them (90 degrees to their motion)
In hitting, now think of your hands (Pressure point #1) as the child on the swing, and the left arm as the chains. Same concept, push at 90 degrees to the motion, but on an angled plane, rather than a verticle one as in the swingset.
Extensor action keeps the chains straight.
In swinging, the picture is a bit more abstract because you are loading at 90 degrees to the plane of the left wrist cock, or more exactly really 'the' plane which is between the arms. The only way to do this is to 'allow' rotation of the left arm in the backswing (startup swivel). This generally gives the 'feel' of getting the left thumb, and even the left shoulder under the shaft such that the left thumb is what loads against the clubshaft, under it. A clear difference in feel due to the rotation of the #3 pressure point, which would then feel on the side of the shaft, vs. behind the shaft with hitting.
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