[marvgarr68]

That's the tricky part. For long rad bends I used my hands. For real short bends like the ones for the IP I put a spring inside. The bends for the IP are real tight. Tighter then 1/2 line should be bent with out a mandrel. The spring I used was for bending tubing but was ment to be outside the tubing. I think it was a 1/4 tubing bender spring it fit inside the 1/2 line perfect. Then bend the tubing the spring keeps the tubing from kinking. Then just pull the spring out.