A spacer for the hexagonal hole in the reduction gear that mounts on the wheel bearing. The hexagonal walls are too large to capture the hexagonal locknut, but the standard Ender M5x30mm bolt can be inserted in the well. This spacer makes the tail of the bolt the right length to catch the grip the Ender M5 locknut.
The author remixed this model.
A spacer to make the gear work with M5x30mm bolts that typically come with the wheel bearings.