cold chisel, or grind a slot in the end of the nut , big screw driver in the slot and loosen the nut, or find a big socket that is a tight fit over the lock nut, if you have clearance with the wheel, bang it on tight with a hammer(not to tight) , unscrew the nuts with a ratchet, put the socket in a vice use a big screw driver to knock the nut out of the socket ..........do it all again.
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