[BerntR]

Hank Haney has a different definition on a swing plane than HK. If the shaft has a constant plane angle it is regarded as being on plane. He advocates a constant shaft plane angle where the shaft plane at the top is above the shaft plane at impact.

It could possibly be argued that such an approach can be combined with keepint the gravitational swing center on one single plane throughout. But it would mean that the hands aren't on the plane except at 3 and 9 o clock. So this way of keeping the swing on a single plane is very different from HK's way where the shaft is pointing at the impact plane line and the hands are on the plane at all times.

Further, HH has positioned himself as a swing teacher with a very pragmatic approach. Adjusting the stroke based on stroke pattern and typical misses instead of building the perfect stroke ground up, so to speak. It will be interesting to see if he is successful with Ray Romano on Golf Channel. There seemed to be some light bulb ignition before they put the series on hold.