his is the smoothest and most stable slider on the market. We use a linear DU bushing on a hard chrome shaft, along with a shaft stabilizing internal piston. The spring cup opposite the adjusting nut is quickly removed with a clip, so there is no need to unscrew the nut to remove the spring. Our jam nut style locking system allows for fine tuning and keeps the nut from moving while racing. The Torrington bearing on the adjuster nut allows for easy adjustment. Sliders now come standard with our OD alignment cups. Our WM165BO and OD cups eliminate spring bow when running a soft spring setup. This is our 21” (WM251-0) extended fine thread body for 5" OD springs.