I dont know what your project needs to show or prove, but there was a separate thread in odds/ends (I think?) about a machine that puts pressure back in dead balls. The general consensus in there was that it is relatively easy to make a similar device using PVC somehow? I'm on mobile or I'd link the thread but maybe consider that as a more mild alternative. Stringers take a reasonable amount of
Machining ability to modify without just purchasing aftermarket parts, I get the impression you're probably doing some kind of hs project and probably don't have access to necessary tools skills for such a large project. Good luck.
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