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John_B_Clarke t1_jcddqq9 wrote

You could try one of these:

https://www.irwin.com/tools/locking-tools/the-original-locking-wrenches

It bears at three points and is designed for dealing with really stuck-on flare-nuts on brake fittings and the like.

An alternative would be to take a Dremel to it and grind it into a regular hex nut then use a wrench on it.

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MishaTiTvog OP t1_jcdj638 wrote

Those are too big. Someone suggested a triangle wrench and i think that will work.

1