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@gbj_tester
It wouldn't be on a proper headset, but the original CK with no split collet relied on the tight fit of the top cap to maintain the centring of the steerer in the upper bearing.
Methane is odourless (that's why domestic natural gas has Methanethiol added to it, to allow human olfactory detection). Hydrogen Sulphide is pretty distinctive, and methyl-sulphides are pretty rank.