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All you need to do is find a proper allen key and undo the two screws that hold the plate over the barrel, the barrel will slide right out. I took mine apart a few weeks ago to lube it up, it was easy to put back together.
I managed to remove one of the screws with a new 2mm key, but unfortunately I rounded the other one.
Drilling or slotting is the next step to try to get that out, unless I find a tool.