CK5 - The Full-Size GM Off Road Community

What is the secret for bending dual plane bends on a pro model 105 or similar?
I need an accurate way to layout,set-up and bend multiple bends.
Right now I use a large protractor,angle finder and a clamp (that Frizz fabbed up)like the one in the pro tool catalog. Kinda trial and error it works,but I would like a more accurate method.
How does everyone else do it?

Well there is a touch to it. Also invest in some magnet mount angle finders, I have 3 for compound bends. They Will allow you to watch the angle in motion (a compound bend). Compounds are are still a pain until you get the hang of it. There is a formula of sorts. I use it in my engineering classes. It tells the center of gravity of an object in 3D. I will try to manipulate it for a comound bend angle and post it up here. I also cheat a little using cad (I know I am spoiled).