Set up in the middle of a door jamb facing one side of the door frame and make a backstroke that delivers the back of the putter flush against the rear vertical plank of the door jamb; then let the putter fall straight across your body beneath your neck and lift the shoulder to deliver the putter face to the opposite vertical plank also flush. To do this solely with shoulder action, you have to set up square with your arms hanging naturally and with the feet the proper distance back so that the putter head as held by relaxed arms is on the line between the two sides of the door jamb.
As you make these strokes, notice that the backstroke does no go across the line away from your feet. In most strokes started with the hands rather than shoved back with the shoulder action, the putter head starts outside the line and this causes a loop. Another problem is setting up with the hands too far out from the body; as the stroke reaches the top of the backstroke and starts down, there is a tendency for the hands to fall inward, and this results in either a pull-cut stroke or a reactive looping into a push stroke or a stroke that bring the putter face too much inside and hits the toe of the putter. But if you set up correctly and move only the shoulders in a vertical plane, these problems don't arise.
The door jamb exercise helps illustrate these issues.
Cheers!
Geoff Mangum
Putting Theorist and Instructor
Geoff Mangum's PuttingZone
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