It's always a very pleasant experience to use a tool that actually does what it is supposed to in a quality manner. I needed to re-plumb the fuel lines to the tri-carbs on my 348. I knew I needed a double flare to be safe (using brake lines). I really didn't look forward to making single flares much less doubles with my current flaring tools. I found the Mastercool 71475 double flaring tool here in Minnesota for $289 ($445 at autozone), it came highly recommended on other forums. I have to say it is worth every cent. It was a pleasure making the fuel lines, perfect each time, and so simple to do. I also purchased a bending tool, Titan, and it makes perfect bends each time ($13). I thought would share this, if you are looking for such a tool, this is a good one.