This is how I set the caster on my 26 Model T. When I got the car it actually had a reverse caster and it would dart left or right and not track straight down the road. I found the spring perches were reversed so they were corrected. However the angle on the ends of the wishbone were way off. These photos show how I calculated the correct angle and how I bent them to correct the problem. The car tracks straight down the road now.