I just happened on this book recently. My only regret is I hadn't discovered it sooner. The most important point for me was discovering how to make a correct lateral hip move. I'd previously just moved over straightening the left leg. This caused me to get 'stuck' far too often so I was unable to turn my hips in anything but an artificial and contrived fashion with the result being an over-the-top heave and all that goes with it. Once I learned from Dante's 4MM to keep my knees bent, pointing them ahead of the ball as I made the lateral move I discovered that I could now keep the hips leading aggressively . This kept the stretch between my upper and lower halves intact which helped accelerate the club. The left leg straightening very late in the process as the club is releasing helped that even more. So my normal 150-yard carry 8-iron started jumping out another 10 yards.
I haven't really been able to use the preset wrist in the manner described. It seems my wrists aren't built as normal and I can't get even half the 35 degrees of radial deviation described when the wrist is kept flat. So, I've stayed with what I have, i.e. a cupped left wrist and an open face. Even still, this doesn't seem to cause a problem now I've learned how to make the correct lateral move.