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@Dammit
With the top cap removed you can see that the hole into which the stem cap bolt screws has hexagonal flats surrounding it at the top- i.e. a large alan key can be used to tighten it in.
This I believe is how the expanding function of the bung is effected.
So I should be able to loosen that, drop/hammer the bung down, then re-tighten it.
What sort of torque value am I going to be looking at here- 5Nm or thereabouts?