Doing some more research, I found Klassen's kindle editions on Amazon. The reviews are remarkably similar to posts in this thread. It's either one star or five stars. It seems that you get all or nothing from his method.
Thanks, OP, for bringing this out. I never heard of Klassen till I read this.
I watched some youtube vids. Tried hitting a few balls - left arm hammering, swinging to a point one foot forward of the ball, and about 6 inches right. I like it! Got solid hits.
Nice thing about Sand Trap, I'm always learning something.