Fix the plate on the tire screw thread, screw the bolt to separate the
    wheel drive shaft and hub by pushing.
Pick the fit output shaft adapter to meet central screw, then lock in
    the transmission shaft, put the frame on, lock the nut and fix the screw
    to pull the wheel shell close to the drive shaft.
Output shaft adaptor : M22 x 1.5, M24 x 1.5, M27 x 1.5, M30 x 1.5