[Yoda]

IF the left shoulder is 'center', and the left arm and club form a line (radius) of that circle, how then does force continue downplane (away from center)?

Does not the straight line of the left arm and club mean that there can be no more driving downplane to the aiming point if this were the case? How could you possibly extend 'downplane' any further after impact?

Yet you can, and should, and must - continue to send force downplane past impact, past where the 'left shoulder center' would require that force to be moving 'up' around the circle.

Angular (circular) Motion is the product of two or more divergent forces and is thus a resultant motion. In the TGM Hitting model, the Mechancial Radius (the Left Arm and Club Lever Assembly) diverts Linear Force (Right Forearm Thrust) into a rotating motion. [An example of this action would be pushing a child on a playground swing.] In the Swinging Model, this rotation is induced by the turning of the Body. [An example of this action is an electric fan.] In either case, the rotation thus produced in the Golf Stroke is 'Down-and-Out' until Low Point and 'Up and In' thereafter.

The Down Plane Drive to Full Extension does not refer to the straightening of the Left Arm -- that Arm is already straight -- but to the Full Extension of the Right Arm. And that is why Thrust should be directed through the Aiming Point (and not just to it (10-20-A/B).