How to replace the broken wheel? -- Model N

1. Turn the hoof up to reveal the wheel.

2. Use M14 spanner to hold the axle and unscrew the nut counterclockwise with a M13 open-end wrench. Take the broken wheel off.

3. Put the bolt into the assembled new wheels.

4. Then put the 8*2 gasket and screw on the nut.
Note:The bolt was puted into the wheels from lateral.

5. Use M13 and M14 spanners screw the nut fastness and flexible rotation.