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Steerer bung: anything cheap that fits, Sigma Sport does one for a tenner that ridiculously mentions sleekness, low profile and etched graphics and also boasts of an alloy bolt.
But first..... hit the original with something heavy (post-cutting) because you will enjoy it, then see if you can compress it with narrow nosed pliers or similar to re-fit. Please post a video of your attempts.
Tractor repair centre indeed!
OK, I'll get a new bung (as much as I like hitting expensive things): are they all much of a muchness, or is there CTB approved one?
While you're here: I read something about 5mm of spacers above and below the stem being necessary with carbon steerers. I'm using a Tester top cap which incorporates a 3mm spacer, so I was going to put 3mm below the stem: death in the face or hugs all round?