Skewer adjustable spring spacer

A adjustable spacer mod for fine tuning your skewer/Harpoon to make minor FPS adjustments.Includes a part that can lock in place with screws for tournament FPS locking.Directions:1. Thread screw into spring cup and work in the threads a bit before further assembly.2. Line up the tabs and insert the screw and spring cup inside the backcap.3Assemble like regular skewer replacing the backcap and B-knut with the new ones provided.