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Samson Classics Regular Driver is designed specifically to install / remove Samson Classics Harry's Nuts (guide flag nuts) to secure and adjust 1:24 guides to the guide post holder. The topside drive design is much easier to use than small open end wrenches, pliers, etc. used to secure traditional guide nuts.
Note: This tool will NOT work with traditional (hexagonal) guide nuts - it will ONLY work with Harry's Nuts (sold separately).