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Stuck lockring, any advice?

Never had this problem before (how many men have said that?), but finding it absolutely impossible to get the lockring off a Shimano HG-500 cassette, which I need to do to replace a broken spoke. It's not that old (two months/1700 km) and has been scrupulously oiled throughout its lifetime but I just can't budge it, even with a breaker bar added to the spanner holding the lockring tool. I know the dodge about fitting the tool into a table vice but unfortunately I don't have access to one. Any tips gratefully received!

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