What indymanjoe said is critical. Careful preparation of the end of the tube is essential to a good flare, especially a double flare. File or sand the end of the tube flat and deburr the inside and outside before using the flaring tool.
Interesting--I also have a Snap-On flaring tool like geeteeohguy has. Been using it since 1981. The tapered portion is getting worn, but overall, the tool has held up well after hundreds of flares, although they were mostly aluminum tubing, not Bundyweld like brake lines.
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