I guess the majority is going to rule on this one. Now I have to re-do all my brake lines. I have been double flaring all my brass and steel fittings just like they do at the factory with my hydraulic tool from MP Brakes and useing 45 degree. Then with the A/N fittings I have I slide the nut on the tube then the piece that goes through the nut and then I double flare the end with my 37 degree anvil. (NOT GOOD HUH?) I guess the single flare on the tube along with the littlle insert under the nut makes it just as strong as a double flare? Thanks guys