If it is necessary to remove the handlebar sleeve for maintenance, first loosen the fixing screw of the brake handle, then scald the handlebar with hot water, and then quickly pull the loosened handlebar out with the brake handle. When installing, you can first apply some oil on the handlebar, heat the handlebar in hot water, erect the other end of the handlebar on the ground, and put the handle sleeve into the handlebar from top to bottom If you want, you can rotate the sleeve in. Attention, must wear gloves to operate, otherwise the hand may have bubbles!