[Yoda]

Homer knew all about the true 3-D club head orbit but preferred 2-D training and talks about it in TGM book. On page 58 in the 6th edition Homer writes “Remember, a flat plane has a straight baseline. A circle is two dimensional and can lie on a flat plane (2-D Shaft Planes).

Homer also knew about the limitations of 2-D training and wrote on page 26 of the 6th edition Homer then writes that precision is lost unless start up is three dimensional. The club head moves Backward, Upward and Inward INSTANTLY AND SIMILTANEOUSLY. (3-D sweet spot path motion).

It seems Homer felt it was better for the golfer to monitor circular motion of the club head in 2-D with a flat plane and a straight base line using the club shaft for the plane references than using the club head (Sweet Spot) with the third dimension of depth and the true 3-D orbit of the sweet spot path back in 1969. Forty years later I wonder what his take would be now.

Homer Kelley recommended that all instructors build an Inclined Plane for use with students. He himself said that until he built one of his own, he could not truly visualize the [three-dimensional] path that the club needed to take.