I have made several aluminum rod slingshots with 1/4" stock. They were relatively easy to make, were accurate, but just didn't have a sturdy feel. I obtained some 3/8" stock and made a few. Oh what a difference that extra 1/8" makes! They are rock solid. The only problem I encountered was the 3/8" stock broke the pine wooden base of my jig. I substituted a heavy, hard plywood and that solved the base problem.
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