High-precision steel screw which has a shoulder, which allows the screw to move slightly inside of the top deck. This special screw allows for fine adjustments of the carâ€™s flex, by adding or removing them to the carâ€™s upper deck.
Adding one or more screws to the rear part of the top deck will reduce rotation and increase stability. The car will have more grip, and more stability under braking. Adding one or more screws to the front part of the top deck will stabilize the car both on-and off power, but it will reduce steering but will make the car easier to drive.