How to replace the broken wheel? -- U Series
1. Turn the hoof up to reveal the wheel.
2. Hold the axle and unscrew the nut counterclockwise with a M13 open-end wrench.
3. Remove the axle and nut and install a new wheels.
4. Insert the axle into the corresponding position. The protrusion on the axle corresponds to the groove on the wheel fork.
5. Hold the axle, screw the nut onto the axle.
6. Tighten the screw clockwise with the M13 open-end wrench.
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