My vicegrip 4LW came in today. It's a dinky little tool, just 4" long. I used a large pair of vice grips on the cut off flex line swage.
At first, the nut still would not budge. So I did all the other things. Turned both ways a few times. Applied heat using mini butane torch. Then gave it another go (with no extensions).
Even going through those steps, I had the flare nut off in a few minutes!
You do need to get the grips on real tight.
Nut is a bit rounded from previous (unsuccessful) efforts, but I think I can file it back to shape. Then use flare wrench to tighten into new flex lines and vice grip for final tightening.
I know I went all over the map thinking (and posting) about what I would do if this didn't work. But at least it was a learning process. I had never heard of those Cunifer lines (BTW, Napa Canada had coils in stock, but it was about $40). Hope I never have to use them though
