I couldn't find any of the gray fittings you discussed at my local Lowes, so I ended up epoxying the cap to at 2-liter bottle to the end of my fitting and drilling out the top of the cap. If all goes well, I should be able to just screw the bottle into the remainder of the cap.
I'm hopping between that and my 1/24th scale Mercury Redstone I was talking about a ways back. The booster is almost completely finished, and I'm currently working on Ton's Mercury capsule to top it off. I want to get it done in time for 4th of July so the kids and I can go flying, weather permitting. I have a couple rockets that need maiden voyages, and I'm expecting to add a "D" powered "Gus Grissom-Mobile" to the lineup!
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