[Mathew]

In most golf techniques, the LEFT LEG is the Pivotal Axis, this is the one we are rotating around during the downstroke, and the weight is mainly on this leg during the downstroke, through the impact area, on to the finish. The Bennett/Plummer techniques even have the weight here all the way throughout the stroke.

I have heard of techniques where the Pivotal Axis is on the right leg. Are any of you familiar with any of these?

Pivotal Axis???

There is no pivotal axis!
Whenever the hips are moving, the legs are moving, the knee flex is changing dynamically, as is the ankle joint - because of the changing 'axis tilt' of the spine as the hips slide and the 'cylindrical' motion of the hips relative to itself under a stationary head (think of a disc (hips) moving around the outside of a big sphere(center of sphere - head)) moving the hip sockets in a circle.

It is not a pivotal axis unless you take it very literally - the terminology is misleading though - it could be in the sence that your ankle is a pivotal axis, or your wrist is a pivotal axis or your neck is a pivotal axis, or your elbow is a pivotal axis....

You could say that the legs act as constraint to the amount of displacement that can occur when the hips make their motion, however that does not in any way qualify it as a pivotal axis to the pivot - certainly in the way you mean't anyhows.