I tried all that and what Sturmey said, with a lot of help from Thor's 1.6kg lump hammer. If it would be that easy, it would be done. If you remember, the last Argos folder I did had the same problem, and I successfully got it off using those methods. It's extremely difficult to hold a stilson or monkey wrench onto the thin metal while you try to turn it, and the metal is starting to distort. That's why I need a tool that's 100% the right shape:A very good idea.
You could use one of these with some sillsons/adjustable spanner/water pump pliers:
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