High-precision steel screw that has a shoulder, allowing the screw to maneuver slightly inside of the top deck. This special screw enables fine modifications for the carââ¬â¢s flex, by adding or the removal of them towards vehicle upper deck. Adding a number of screws towards the back part of the top deck will certainly reduce rotation and increase stability. The automobile will have more grip, and much more security under stopping. Adding several screws towards the front the main top deck will support the vehicle both on-and off power, nonetheless it will reduce steering but is likely to make the vehicle better to drive. Machined from HUDY Spring Metal. Pair of 2.