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Woodburning with Electricity
The launch cord is used to dislodge the knot from that slot you cut in the back of the cannon. As for a smaller barrel I think it would depend on what you wanted to shoot from it. There is not alot of space inside the barrel and things sometimes get snagged, but there is one way to find out. Good Luck!
Inexpensive, easy to build, peristaltic pump
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