C-Otto-pult

Requires a rubber band, another servo (like the ones used by the wheels), a screw to mount the latch, and some super glue. Feed the axle through the bottom hole in the uprights, then glue the arm in place. Loop the rubber band through one of the top hole in the upright, then feed it through the arm. To attach the other end of the band, you will need to tie a knot in the rubber band and a stopper is provided to keep it in place. Add in the servo, attach the latch and that should do it!