garyt1957
gary, you are correct. I play with The Reflex Swing. But my swing speed is 85 mph. I can't do the convex strike. But the three principles of a narrow stance, the turned towards the target of the right foot 20 degrees and the left 45 degrees and the rotary movement of my lower body, pivoting on my left heel had given a consistent swing and a few yards longer too.
If you read my reply to braveheart, I have improved on Mindy Blake's swing in those 3 areas which is repeated in this reply to you (see the first paragraph). My stance is 4 inches wider than Blake's and 6 inches narrower than Hogan's. It is a good compromise for it to allow the rotary movement of the lower body to be fast enough yet to retain stability.
The two feet in my swing are turned more towards the target. The right is 20 degrees; it holds the right side more sturdy to allow for a better generation of energy in the backswing which is shorter at 10 o'clock. The left foot at 45 - 60 will not impede the downswing of even the faster swingers. The very open left foot will benefit any swing speed.
The rotary movement of the lower body is much much more powerful than Blake's use of his legs.
All in all, I have used many of Blake's ideas. I have radically improved on them. But I have devised many other innovations too. Otherwise, it won't reach a swing that has the capacity to do the probable revolutionary 'convex' strike on the ball. I like to say that the convex bend is more powerful than a concave bend. And there is no third-way to bend a shaft. So the future is with the convex strike. And my concept, The Reflex Convex Swing will be able to deliver it for those with a high enough swing speed, perhaps 100+ mph.
I have played with the Reflex Swing for 40 years. Note the narrow stance that I used, the rotation of my left side and of course, my pivoting on the left heel with the left foot opening. If I had enough more swing speed my left foot would have 'fan-slide' open more. Here is a photo of me at 77 years old.