High-precision metal screw which has a shoulder, allowing the screw to move somewhat inside of the top deck. This special screw permits fine corrections of the carââ¬â¢s flex, with the addition of or the removal of them towards automobile upper deck. Incorporating several screws towards the back the main top deck will certainly reduce rotation and increase stability. The car may have more hold, and more security under stopping. Incorporating one or more screws toward front an element of the top deck will support the automobile both on-and off power, nonetheless it will certainly reduce steering but is likely to make the vehicle easier to drive. Machined from HUDY Spring Steel. Group of 2.