To me there is very little possibility of a wobble in the arm only stroke. As I mentioned before the only thought is to straighten the right arm...a ponderous motion as Yoda puts it. However, do you gave the coconuts to do it? A typical miss for me comes from not straightening the right arm and then attempting to square the face with my shoulders, and when things go really bad...my hands. I find with the shoulder only stroke that I can still mess up the hinge action i.e over roll it, or under roll it. Using # 1 with the forearm pointing at the plane line gives me an "automatic" The geometry is taken care of I just gotta move! I have not yet learned how to incorporate the "right shoulder position gauge" into my routine. Perhaps practice strokes over the ball? Last comment: it is really helpful to keep the left arm extended. I had to cut my putter down to 31 inches to achieve this.