I'm currently trying to get hold of some square nuts, the ones with the really sharp corners instead of the rounded ones.
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That would suit my "Marble Cannon" quite well. Big slingshot, wide forks and big pouch.Hex nuts tied together by string, and you have "bolas" of sorts. Give this a try:
You will need a large pouch. For safety reasons, preferably use a fist grip slingshot with higher forks to keep your fingers well out of the way, just in case. :hmm: