Unbolted the compression bung at a quick guess? There's two allen keys required - the larger size does the top cap, the smaller tightens the bung. I reckon you've undone the bung, and the whole assembly is now spinnin'
4mm bolt inside won't budge, although hard to get any leverage on the short end of the allen key.
^ beat me to it
Weird. It looks like this inside...probably.
4mm pulls a pair of wedges closer together expanding the bung. Top cap screws on to the bung assembly.
Not sure why the 4mm won't turn at all : /
@mrJL started
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Unbolted the compression bung at a quick guess? There's two allen keys required - the larger size does the top cap, the smaller tightens the bung. I reckon you've undone the bung, and the whole assembly is now spinnin'