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@Brommers
It'll work fine but it's heavier than a normal star-fangled nut. I've just finished gluing a home-made bung in the steerer tube of my TT bike. It's similar to tester's, but not anodised, and I've taken some more material off between the edge of the bung and the centre threaded section to save that vital 0.45g.
The reasons I glue in homemade bungs is because:
In reality though there's probably no significant advantage over an expanding bung in a carbon steerer.