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flaring tool so as you're screwing down to the pipe, it won't crack. Btw, use about a dime/penny thickness so you don't over flare.
ex. if you're using the flare tool like I think you are (something similar) [ http://www.rothenberger-usa.com/09.html ]
Put the tube through the flare tool and put a dime (best) or penny (good) up to the pipe so the pipe is equal height as the penny or dime. Then as I stated above, oil the tip of the clamp that spreads your pipe so as it's spreading the pipe, it also oils which will greatly reduce the chance of splitting.
OH!!!!, are you also taking a knife or something sharp to "de-bur" the pipe before flaring? That can also cause it to crack.As far as double flaring which I don't have any experience doing, in my HVAC course, we used the flare nuts w/ our flared tubes so if anyone questions my abilities, I had to do this PLENTY of times and pressurise it to 350-375 psi to make sure it (nitrogen) held. I don't know if the lines on the Z were steel or a tougher aluminum, but we always worked w/ copper so it may be different then what you're trying to do. If you're using like 1/8" or 3/8" lines, the dime/penny trick should work good. Otherwise, bigger lines may require a nickel as your cheater tool. Hope this helps Nix
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