[O.B.Left]

If you look a Single Vertical its actually the same geometry as "straight back/straight through" putting . What you'd get with the Pelz putting rails. "Covering" the Plane Line.

Angled is the geometry you'd get when you use an angled plane board or with a running of the shaft along a string line or running the heal of a putter around a putting arc where you're "Tracing" the Straight Line Plane Line. I think.

Single Vertical has two forms of Steering going too.......which is ok for putting but death for fuller shots. Steering being the "seems as if" it should work , false logic that plagues golfers until they understand the geometry revealed by the Machine.