I use a Push Basic putting stroke with an open stance and Vertical Hinging. I used the Paw strike (rocking) before, and experiences that Paw required more body movement than Push Basic. With PB I feel I hardly need to employ any body movement at all - unless the putts are very long.
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When James Durham recorded 94 at the Old Course at St Andrews in 1767, he set a course record that lasted 86 years. Golf: A curious sport whose object is to put a very small ball in a very small hole with implements ill desiged for the purpose - Sir Winston Churchill
Arm only stroke, go ahead and lock the ankles, hips, or whatever to keep the lower body steady. Shoulder only stroke, allow some flexibility. Mr. Kelley did not want us golfers to lose the radius of the circle. He didn't want us to be moving low point around. That is where his genious on the putting green comes out. He is advocating a very simple stroke.
Imagine a radius (either from the left shoulder for the arm only or from the spine for the shoulder only) and your job is to keep that radius constant. Don't move the head or sway the body. Don't rotate the hips or roll the feet. Just keep it simple and TRACE THE BASE LINE, KNOW THE HINGE ACTION YOU ARE USING, and KNOW YOUR GRIP.
After you get good on the greens. It is time to get great! Now get precise with things. Go back over your stroke components and create precision.