Anyone use Earl's brake lines?

If so, what does the spring do that is next to the end of one side of the hose do? What do you connect it to; it self, or the hardline?

Do you use the U clip or just stick the end through the brake line holder and have the nut that comes with it, hold the line to the brake line holder?

The only spring I have seen is for the parking brake cable. They are stainless braided hoses? I have stainless to hard line. I have the nut with the grove in it. I welded new "L" brackets on the axle housing that the nut sits in and a "U clip" is used to hold it firm. JR

http://www.holley.com/data/products/pictures/mediumHyperfirmUSpecIt.jpg
the one end looks like the line at the top of the picture.

Those are there to make them DOT approved. It keeps the hoses from kinking if bent over too far. Pretty ugly huh?