iirc some of those come with a solid threadlocker from the factory.. heat breaks it down.. a couple careful mins with a cheapo propane torch
then I would try some big vice-grips... and maybe a 2-3lb hammer
if that doesnt work carefully grind 2 flats on it and use an open end wrench/cheater bar if the vicegrips fail again.
then I would try some big vice-grips... and maybe a 2-3lb hammer
if that doesnt work carefully grind 2 flats on it and use an open end wrench/cheater bar if the vicegrips fail again.