> they do Lego
Most do, but check every combination you have if you’re curious.
Individual variation among parts, even of exactly the same light, is rather significant.
I noted that in the “what Legos with what?” thread.
I have several times tried to “Lego’ the various parts of three or four flashlights — identical model — and found some combinations of threads were loose, some squeaky tight, and one or two simply wouldn’t work.
My theory is that, at assembly, they have a bin of heads, a bin of tubes, and a bin of tailcaps, and they screw with them until they have a complete set of three, then send that on — tossing back any pieces that are too loose or too tight, to retry.
So most of the parts fit fairly well together, but there are a few on near and far edges of tolerance that when put together won’t behave well.
It’s reassuring to see how very tolerant … no, don’t let me get snarky (whack) …
EDIT — quoted Sharpie’s info in the What Legoes With What thread