Spool racer

See introduction at this link.
You can make a little racer from a spool, two tacks, a 3" X 1/4" dowel, a bead and a rubber band. Drive the tacks into one end of the spool, wrap the rubber band around them, thread it through the hold in the spool, through the bead and around one end of the dowel. Wind it up and race it on a smooth surface.