Tandem Slider Positioning Tool Zinc Plated, 2 1/2" long, 2 1/4" outside diameter, 1 3/4" cup depth, 1/2" flange depth, 1/2" internal hole size Using your tandem slider stop Insert the Tandem Slider Stop in the desired hole. Release the trailer slider lock mechanism. Release the tractor parking brakes. Slide the trailer suspension until it hits the Tandem Slider Stop. Set the tractor parking brakes. Lock the trailer slider. Remove the Tandem Slider Stop.