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It's definitely threaded. Can you start it off by tapping with a screwdriver in a counter-clockwise* direction?
Then some needlenose pliers with either side of the jaws located in the slots... you should be able to rotate it out.
Grease it well when you put it back!
*the one in @fredtc 's photo appears to be a standard thread.
Ben689908
peter_v
Cheers. Tried a freewheel tool like that but the holes in the retainer are not opposite each other alas. But thanks to the cross section pic I now know that it has a thread and thus might/will come loose!