When installing new lines on any setup what are the dos and don'ts? I've seen rubber lines comeing off the Mc for 12 inchs then going to steel, I've seen the steel lines with a few twist comeing off the Mc Then a Straight line comeing off the Mc going to the Ts. Im getting ready to put in a lot of new lines on a few cars n trucks. I bought an old, "I think!!! "CAL VAN' Double flareing tool from the 60s or 70s at a yardsell. So i've been Double flareing on some stuff just to see if I can do it! Im to the point where there is no leaks from the flares! HAHA so i was just wanting to know the dos and don'ts. Thanks!