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The (PO-TENTOOL) line trimmer adapter has been used and tested only on the STIHL® gear head models 2005 and after. Of the 5 units used in testing, none had any drive component failure. The PO-TENTOOL adapts the metric left handed thread of the trimmer drive shaft to a standard 5/8 thread. The design and manner in which it is inserted to the adapted before threading on to line trimmer (as shown in diagram) allows it to rotate without UN-threading itself. The adapter sold solo is recommended for buffing and sanding and diamond polishing stuck to S M Arnold Velcro backing plates.