There used to be a book called "How to do nothing with nobody alone with yourself". It had directions for making a car out of a wooden spool. You make a washer out of a sliver of soap or the paraffin from the top of a jam jar if you have a really big spool. You thread a rubber band through the hole of the spool with a broken off wooden matchstick on one end to hold it in place, the washer with a long matchstick on the outside of the other end(break off the tip). Wind it up and the long match will push the spool around. Amusing for the grandchildren.