Just did this a couple weeks ago...Broke the connection loose and the line nut was turning, I didn't realize it wasn't turning on the line, twisted the line right off. Dorman makes a repair kit. Cut the line with a tubing cutter back where it is straight, bend the new tube to match, and the kit comes with a compression fitting to join new/old lines so no flaring needed. was an easy fix but better to avoid it as Scotty says,