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When your tempo changes, your speed changes. That's why you leave putts short or blow them past. This tool trains a perfect pendulum motion so that your speed becomes reliable and you start your putts on line. It forces you to swing the putterhead correctly and gives you instant feedback when you don't.
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The String Theory Golf Putting Trainer is a fabulous tool to teach with and learn how to develop a putting stroke with TEMPO! It is terrific at learning a passive transition from the backstroke to the forward stroke, while maintaining a consistent speed with the putter head.
(Be advised. If you struggle with speed control, be patient as you teach yourself how the String Theory Putter is used)
George Pinnell, PGA
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George · January 16, 2026
Great product with a lot of feedback when using it.