[KevCarter]

I am curious how you had to go "outside the book" in order to fix the problem? Over plane and under plane have the same problem, they are both off plane.

Someone once asked Chuck Cook what was new in golf instruction and he replied, "nothing. I am still teaching hookers how to slice and slicers how to hook." I have used the same philosophy many times, if someone is under plane, then I have them "feel" like they are hitting pull-fades. Sticking a dowel in the ground 6-10 feet in front of them on the target line and having them start it to the left of it with a square stance has also helped.

Ultimately you have to get the student to make a different motion than that which they are accustomed to, both from a feel and geometrical standpoint.

golfgnome,

You certainly don't need my validation, but I agree 100%. I have been under plane and way in to out for years without realizing it. Getting on a plane board and using the principles of TGM, I had no idea how much "LEFT" it feels to get the club back up the plane in follow through and finish. It's all in our little yellow book, we just need to apply it correctly.

Kevin