[john]

I suppose you could also use a grinder.... Drilling would be hard as you do not have a good surface to start. I would continue trying to cut it off. Try to go slow so it doesn't fuse as easily like before. Just need to cut the nut off. I would start at ~10 oclock and cut part way through, move to 2 oclock and cut part way again and see if you can break part of the nut off.