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Step 1: Sizing

First determine the inner barrel size of your potato cannon mine is 1.5 inches

Step 2: Main Body

You are going to take half of a water bottle and cut off the bottom and cut a slit up the side and size it a little bit smaller than the barrel

Step 3: Stuffing

Take a rag of some sort and stuff it into the projectile and tape it closed

Step 4: Finishing

And the wrap in duct tape and fire

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