[Mathew]

Basically the left arm and clubshaft form what is called the "primary lever assembly". It is a law of the universe that to move something you have to create a pressure against it. In golf there is only two points which can move the primary lever assembly - pp4 and pp1.

For swingers - where the left arm is against the chest, you create a pressure to drive the entire primary lever assembly into impact. At the same time, the rotated lag pressure point is thrusted towards the ball or along the plane line at an aiming point.

Thats really the way it works...

The hands are always aiming whilst the pivot drives the left arm and club....