[Mathew]

Clubhead force and motion is onplane. To keep an object such as a golf club thats on a plane, the thrust to move that object must also be on that plane. This is the sameness of hitting and swinging.

When pp4 creates a pressure against the primary lever assembly for the swinger, both hands remain flat to the inclined plane and since the golf club doesn't want to go along with you, it creates a pressure against the first knuckle as the power package is being dragged downplane longitudinally.