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Any commercial plumbing supply should be able to set you up. When it comes to brake lines, I would want a new set-up. You can use the old one for simple house plumbing projects that you don't need the double flare. Sorry Torque1st. Good luck....
That's OK, it is an old tool and die makers trick. Works good but obviously can't be done again or things get out of round. The sealing surface is formed by the round dies so they are perfect, -well as good as the tooling was to begin with.
Double flare tools can be purchased at any good tool store or professional auto parts store.
Those double flare tools make a nice hose retaining bead on tubing. All you have to do is run the first part of the flaring operation to put a nice barrel crimp or bulge in the line. This is useful on fuel lines, tranny cooler lines, and power steering return lines.
I just bought the K-D version and it works very well.... I fooled around with a couple of cheaper bar-type models, but found the pressure you need to make the first bubble in double flaring usually pushed the tubing thru the bar... had to start using pliers to tighten the wingnuts.... too much fuss... the K-D mechanism puts direct pressure right on the tube and I experienced no slippage with a normal effort tightening to secure the tubing.... I also found that their tool kept the little seam on the tubing from getting exagerated on the back side of the flange.... first total rear end to proportional valve job and it was very successful... sorry for the long post, but this is something I've just been through