Another option is to get a short bolt with a 14 mm head (sorry I don't know metric well enough to know what size bolt has that head) and a couple nuts to fit it. With it double-nutted, you should be able to get enough torque on the inner nut to turn the plug out of there. Could even triple-nut it if need-be.
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Keep everything as simple as possible-but no simpler--Albert Einstein
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