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What are the nubs on gold knex pieces for?

The half circles with the nubs.. What were they made for?

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Owenmon8 years ago
Wait, you mean the ones that are red rod length?
Wafflicious (author)  Owenmon8 years ago
The connectors.
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.
Wafflicious (author)  Owenmon8 years ago
ooo
Owenmon8 years ago
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.
An Villain8 years ago
i thought they were orange
The Jamalam8 years ago
the orange tubing slides on to them as far as i know.
Wafflicious (author)  The Jamalam8 years ago
oh