The half circles with the nubs.. What were they made for?
Wait, you mean the ones that are red rod length?
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Oh, Those are for the track, too. The tips of them is what you put the tubing on. Their not any different then the yellow connectors. They just have a tip that you can stick tubing on.
They were made for the original k'nex coaster. It's a red rod wide so to keep the track from squeezing together, they made the nubs.
i thought they were orange
the orange tubing slides on to them as far as i know.