I assembled the pupils of the eyes with tubing, the pipe nipples I bought, the washer/nut assemblies that make the pupils themselves, and a couple clamps. Basically, I fit the end of the bolt that's welded to the washers that make up the pupil into the end of a short piece of polyethylene tubing. I used the pipe clamp to tighten it down and then glued it into the pipe nipple on the frame. I gave it a quick test with my LED light and it seemed that it might just work.
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