The PlaneFinder is a unique device that provides instant feedback if the club deviates from the proper plane on both the backswing and downswing. The device corrects your plane with its plastic guiding stems. If your swing starts to move too far out of line, you’ll hit the corresponding stem and learn how to make subtle adjustments with your next swing. The beauty of the PlaneFinder is that you learn immediately what you’re doing right and what you’re doing wrong.
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Hank Haney’s PlaneFinder

Hank Haney Plane Finder