Brake line bubble flare -- need advice Options

[strawman]

I am replacing all hard brake lines with Cunifer metal lines and new brake line nuts. I bought a Craftsman double flaring tool, with the understanding that I only need to complete the single flare. However, as shown below, I am not sure the flare (the copper colored flared end) is appropriate. Any suggestions?





By the way, this Cunifer stuff is pretty flexible and it is supposedly kink-free. You can buy it through http://www.fedhillusa.com/

Thanks in advance!

[ArtechnikA]

Bubble flares seal by the end of the hardline mating its corresponding flat/conical surface. The threaded part serves only to press the flare tight against its mating surface.

So if the flared bit isn't big enough, you will never get it pressed against its mating surface hard enough to seal before the threads bottom.

I don't believe your sample flare will seal.

[ChrisFoley]

So if the flared bit isn't big enough, you will never get it pressed against its mating surface hard enough to seal before the threads bottom.

I don't think the threads will bottom with the flare shown in Geoff's post above.
The shape of the new nut allows it to go deeper than the oe piece.