Please excuse my beginner question, but what do you mean by the "real plane"?
If you ever picked up Hogans Five Lessons, he introduced the concept to the masses, that the golfswing is performed on a geometric inclined plane. Actually it was introduced prior to Hogan, but probably didn't hit mainstream consciousness until then.
Hardy has unfortunately introduced a great deal of confusion regarding terminology.
In TGM swinging the clubshaft on the inclined plane without deviation, is one of the three basic imperatives in making a sound golfstroke. From putt to drive.
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