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When I was a child we made slingshots by using the top of a plastic bottle, an air balloon and a rubber band. It’s very easy to make. First you draw a line around de bottle at tree or four centimetres from de top, and then cut out by the line. Once you have the top of bottle separate of the bottom, you remove de cap and put the air balloon around the mouth of bottle. You fix them stronger by using a rubber band.