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Originally Posted by ArmoredFairy698
I'm looking into making one, but I don't know how to keep it entirely self contained and automated. It needs to be some sort of interior mechanism that has the ability to move the "arm" up and down.
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A nu-matic could get the job done, and be fairly self contained. The only problem is the speed. Depending on the length of the extension, it could get pretty slow (and fairly large in a diametrical sense).
Good Luck!