I made this a while back. I won't elaborate much, and I won't post an instructable on it. If you want to make one, base it off this. It throws small objects (i use dice/erasers/dice shaped erasers/stickytac/etc.) about 5 feet. It's composed mainly of popsicle sticks, hot glue, string, a sling(that i made), and a fishing weight.
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