I am offering my advice based on my experience. I hope that's not bickering.
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I absolutely blame the tool but again, let's be clear, I'm talking about a tool that cost no more than $30 (what is usually in stock at the local parts store) for my experience, not the 119.00 AU that Warren posted. For 4 times as much, I'd expect much better results.
The ones I've used were lacking in the qc department, clamping bars that don't quite line up with one another - you can't simply make them flush with one another, if you do that, the taper doesn't line up- wing nuts that are impossible to tighten sufficiently to hold the tubing without using pliers, they mar the tubing, sometimes so much that the nut doesn't slide back over without filing the tubing smooth. Even if I followed the instructions to a T, cutting the line square, deburing, setting the proper distance between the clamp bar and the end of the tubing, the results were poor. I've probably made over 100 flares with those tools. None of the flares were ideal by any stretch of the word. I'd estimate that maybe 40% were usable, would get you home, but nothing I would trust for a long term fix. Single flares, I never had an issue with. The double flares were terrible. I absolutely will not use one of them again. I'm not claiming to be a pro, or skilled, but they were junk.
On the subject of the hydraulic tool, have you used one yourself? That is one I'm considering.
Lawrenceville, GA