Okay...for something so simple I am making this very complicated. I have tried this and see a lot of potential and most significantly the opportunity for consistency in my swing.
What I am having a problem with is the idea of pressing down on the left thumb knuckle. When I do this, I get something of a backward wrist break with the right wrist, but I definitely do not get a cupping of the left hand or a rolling under as described in the book. I continue to see two knuckles on the left hand. Only when I manually force it to roll under do I eliminate one knuckle.
Also, it seems to me that I hit the ball better when I "push" the right thumb pad against the side of the left thumb as compared to pressing down on the left thumb knuckle.
I would appreciate any comments or suggestions...Thanks