Double flaring, particularly on a steel line, is a skill that has a LONG learning curve. It's doable, but using a fancy (translation: EXPENSIVE) flaring tool makes the job a lot simpler! Don't forget to put the nut onto the line BEFORE you make that perfect flare!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!