I believe I have found "the tool"
It's an "inline bubble flare tool" which clamps the line very securely, and die pressure is applied perfectly.
Best part is that it's only $30. I got mine from matco tools.
Only thing you need to watch out for is twisting the line the as you turn the center screw.
I tried the bar style clamp an before and I could not get it to flare properly. I am very happy with the way the flares came out with this tool. I am yet to try them out on the car though.
