String Trimmer Spool Winder for Ryobi Trimmers

This is an adapter for Ryobi string trimmer spools to allow you to efficiently wind them from bulk spools using a drill. Simply slide the winder through the hole in the spool, click it into place, and then grasp the protruding part in the drill chuck. From there, SLOWLY wind the filament onto the spool at a controlled pace. This allows rewinding a spool in short time and with little effort.

There are two sizes provided, with 15 teeth and 7 teeth. It seems Ryobi switched the tooth count to