Features: Gently tighten the hexagonal screw on the top of the hanging heart until the expansion is very close to the inside diameter of the fork. Slowly put the tube of the front fork, make sure that the distance between the expansion head and the inner wall of the upper tube is small enough. Hold the headset cover, make it slightly skewed, and the underside expansion head snap against the inner wall. At this time, tighten the upper hexagon socket head screw. Do not use excessive force.