Our company’s damping force adjustable system is undertaken by turning the click on the top of the shock absorber shaft top. After a long period of use, dust, dirt etc tend to get stuck in between clicks (click “A”, click “B”), restricting it from turning smoothly. In this case, either blow air between the clicks or use some form of permeable lubricant to smooth out the click operation. Diagram 1: If dust etc restricts the click movement, please take care not to force or over apply pressure when turning the click because this cause damage. Also, to prevent any dust from getting stuck, please put the ADD cap (the black rubber cap) on the top of the shaft.