Best option - Make friends with someone who has a Mastercool flaring tool.

15 years ago, I went nuts for about 3 weeks trying to get one of the "old, reliable" flaring tools (the ones like in the link above) to work correctly, as I was completely re-plumbing an old Z race car. Results looked really ugly, and wouldn't seal worth a crap.

Finally figured out that the little round die thingys were machined off-center, one side vs. the other. Well, howdy and wtf!. You could hold the little nib on one side, spin it between your fingers, and the dimple on the other side would wobble like a drunken frat boyl. Wtf! again. Apparently, I was the manufacturer's quality control staff, as they were quite surprised when I called them to bitch. Bite me, O#d F*&ge.

At present, that tool is tasked with popping open those "hard to crack" pistachios in the shop. That's all it's good for, imo.