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Launch It: The Pneumatic Potato Pistol.

Step 2The Barrel

The Barrel
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Cut off about 6cm (about two and a half of your American Inches) of the blunt end of the pen.

Near the closed end of the pen, drill a hole large enough to take the syringe nozzle. Note that the syringe I am using has a wider diameter near the base of the nozzle, and that is the diameter I am working to.

If you are planning to use the pistol to fire actual potato, grind the open end of the pen to a slightly chamfered edge. It doesn't need to be razor sharp, it just makes it easier to push into your spud.
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Author:Kiteman(The Complete Kiteman Shop)
"Happiness is a shed full of power tools." If you need help around the site, or with a project, feel free to contact me.