The main job of the headset is to allow the front wheel to turn. In order to properly adjust a thread less headset, follow these steps. First, remove bolt and top can to re-install cap and bolt by hand only and make sure to not over tighten. Loosen stem bolt that secure stem to the steering column. Lubricate these bolts if they are dry. Note do not lubricate inside stem Orin steering column surface. Wiggle the stem straight side to see that it is loose. Align stem straight to wheel and gently secure the top bolt. Stop when any resistance is felt. tighten stem bolts. Check for play by pulling back and forth on fork. Turn the handlebars in different directions while checking for play. There may be play at this early setting. Use care when grabbing suspension forks, because the legs may have play. Grab upper portion of fork. To adjust bearing, loosen stem bolt. Turn adjusting compression bolt in center cap only 1/8th turn clockwise. Secure stem bolt, check for play again. Repeat adjustment as above until play disappears. Remember to loosen stem bolts before turning adjusting bolt in cap. Check alignment of stem and tighten stem binder