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.

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1982 240D 4-speed
2013 Jeep Wrangler Sport - 4.10 e-locker