Using this Easel file, cut the treads, eye bezel, and medium-sized gear. There’s an extra gear in the file in case you need it.
Assemble the treads to the body using a little bit of wood glue. The parts should fit right together.
Attach the gray eye bezel with a little bit of wood glue. This part is not meant to be removable.
The rest of the parts are meant to be removable, so just clean them up a little and put them on once the treads have dried.