Pardon my ignorance, but are the expander bung and top cap bolt not one and the same thing?
The top cap bolt pulls between the top-cap and [something stuck in the steerer].
A starfangle can't not be stuck, but the expander bung needs to be tightened so it's stuck in the steerer.
@Emyr started
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Pardon my ignorance, but are the expander bung and top cap bolt not one and the same thing?