I haven't made enough tanks yet to carry around extrasI agree that the 3 ml plunger is pretty huge. I would also love something in between, but alas, as everybody has mentioned, that hasn't been found yet :/ Then again, not long ago, we didn't even know about building tanks, so I would say that I'm sure an answer is right around the corner. Somebody will wander in, or go shopping somewhere and find that perfect filler plug and say "Hey, check this out guys!". That's how we found the greatness of the saddle valve to put holes in cartos after all
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It's great how things get worked out, isn't it.