Winners at the Automechanika/Motortec Fair 2013' Innovation Gallery !!! see video
US Patent Nº 9,757,782 B2 Freely Rotating Magnetic Tip with Surface Trace for Dent Removal Rod
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This allows you to pick up the surface trace once you've finished the repair as doing so with your fingers can be tricky. You can also keep a trace here when storing tools so you have it to hand.
See video demo at http://youtu.be/dq27jW1kKrs