[purehitter]

Purehitter, you mentioned "Until recently it was not easy to
verify swinging the sweetspot of the club head on plane and
in balance from start to finish".

What is the easy way to verify that the sweetspot is on
plane and in balance from start to finish?

Donn

I designed a 3-D swing trainer that shows how to do this. I am also the designer of rover golf swing trainers. The Power Angle Pro, Pure Swing, Power Release and the Power Drive Pro. I am working on a video and a book about this concept. I will keep you posted on the release date.