if you get access to a grinder you could grind two flats on it to make something to get a spanner on, much easier than cutting a slot
This seems like the way to go, if you can't find a grinder then maybe a file would do the job?
@TheShipwright started
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if you get access to a grinder you could grind two flats on it to make something to get a spanner on, much easier than cutting a slot