That's a good idea for laying out the degrees. What I don't understand is what is magic about 20 degrees? If I am turning the tires the same amount both directions by using the steering stops, aren't I basically doing the same thing? Again, I don't really care what my caster numbers are as it looks like 3 - 4 degres is best-case you'll ever get with factory uppers and offset bushings. I just want to know if what I am doing is a valid comparison of the caster value on each side, whatever the number might be. Isn't caster just found mathematically using the camber gain/loss when the steering is turned?
