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I am a curious soul with the means and ability to take over the world....but I would like to avoid any such headaches so I create to give kids with disabilities something to remember.
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- Wise Raven commented on Wise Raven's instructable Slingshot Cannon
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!