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@Dammit
Right- Boardman CX Team.
This has a carbon fork which has a carbon steerer.
There is a bung in the steerer rather than a star-fangled nut into which fits the stem bolt with which one pulls the fork/stem/headset assembly together before torquing up the stem bolts.
I cannot seem to get mine to tighten sufficiently, and when I remove the top cap, it's lenticular shape seems to sit rather too closely to the bung- I suspect that what is happening is that the convex underside of the cap sits on, rather than above, the concave top of the bung, limiting the amount of clamping force that can be applied to the assembly when one torques the top bolt.
So, I (think) that I need to move the bung down in the steerer- is this a simple case of undoing it, striking it firmly with a hammer* to drive it down, and then retightening it?
Or does one have to cut the steerer down by ~2mm or so?
*One for Murtle there