Picture #1- There is a lot of discussion concerning the plane angles the putter moves on. The most mis-conceived notion is that during a "shoulder only" motion the putter will move on the shaft plane. This is JUST NOT TRUE. If indeed the shoulders (left shoulder plane angle) are the ONLY moving part during the stroke putter will move in a plane which goes through the THORASIC REGION of the spine.
Moving the putter along a bench with an arm only stroke and then with a shoulder only stroke will both trace a straight plane line, however, the arc of approach and arc of separation will be different. There will be more arc in the arm only stroke than in the shoulder only stroke. The reason is because of the projection of the plane on the ground. The flatter-the more the arc- the more upright the less the arc.
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