I've a pet project that I've been working on for a long time, but I've reached an impasse. To continue, I need some self-extending/retracting telescoping rods, which operate in concert. I've come up with some designs, but I wonder if I'm not over-complicating this; I don't want to reinvent the wheel, and it seems like such an object should already exist, even if I haven't been able to find anything online. Does anyone know of a store or vendor that sells something like that? Or have a link to instructions for making such a thing?
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