I made one of these spool tanks when I was in Cub Scouts way back before they ever put a man on the moon. I believe it was one of the first things I ever built. It was fun to play with. It taught me some things about simple machines. I used a real knife to carve the notches in the spool and didn't cut off my thumb!
Mechanical Toys is a site that has directions for making a spool tank, a rubber band gun and a bunch of other cool toys. There are photos and diagrams for building most of the projects mentioned (some have a coming soon message). There are also links to other mechanical toy sites.
Now if I can only find a wooden spool in the junk box in my garage.
[Image captured from Mechanical Toys Page: http://users.bigpond.net.au/mechtoys/index.html]
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