@psg1ben I was being stupid. I thought that the collar had threads as well as the nut. Anyway, it didn't so I cut the fucker in the middle, as you and @midlife suggested. And with a dremmel, which I don't usually have a use for. So problem solved, inc sparks and noise. Now I'm having a negroni and eating crisps. Wins all round.
@psg1ben I was being stupid. I thought that the collar had threads as well as the nut. Anyway, it didn't so I cut the fucker in the middle, as you and @midlife suggested. And with a dremmel, which I don't usually have a use for. So problem solved, inc sparks and noise. Now I'm having a negroni and eating crisps. Wins all round.
Thanks everyone