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I reckon they probably have a tool that looks a bit like a pushrod with a pin across it.
I also reckon you could get it tighter if you dunked the body in some boiling water and left the inner in a freezer for an hour or so.
I'd put some locktite on the thead as well if you're determined to persevere with that slave, but it would be good to find out what is unscrewing it first.
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