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 : /
@Howard started
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4mm bolt inside won't budge, although hard to get any leverage on the short end of the allen key.