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How to Make Projectile Gadgets that Go Boom!
Tuesday, August 11, 2009 3:33 PM
I’m sure that most of you out there that like projectile gadgets have built a potato cannon at least once. What about the other fun little projectile gadgets like matchstick rockets or tennis ball mortar? There are many ways to make these gadgets and instructions can be found all over the internet, but books like these two provide a step by step instructions... Read More...

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