Thanks for the clarification, Jonitus. Now it's stupid question time. You refer to a "cradle" and a "chassis." Elsewhere I've seen references to "sleds". Are these all different things, and if so, what exactly are they? What did the chassis made from the battery case hold?
Finally, do you have a part number or URL for the polycarbonate tubes you use? I seem to remember coming across such things when I was searching for something else entirely.
I hope this isn't too off-topic. It seems to me that one reason people want to know the inner diameter of MHS parts is precisely to figure out what kind of tubes and pipes would fit snugly into them. Thanks again.
EDIT: Would I be correct in thinking you are using sleeves made for T8-sized fluorescent lamps, like
these?
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