Adjustable spring perches are essential
These spring perches were indispensable to my Rat Rod project. Using a Model TT truck frame and a '34 Ford front end, I had no way to determine the proper Caster. I know it needs to be 5 to 7 degrees, but HOW? Until I built the frame, had the final wheel/tire combo on the ground with the drive train and body weight creating the final spring loading, there was no possible way to estimate the precise finished stance. I couldn't leave the front cross member loose so it could rotate and weld it up later because I needed that cross member welded securely to help square the frame. SAVED by the adjustable spring perches. Since they will allow the spring to rotate freely, now when I am entirely done I can simply set the proper caster angle in as a final step and bolt/ weld up the split wishbone plates. One further advantage: I was concerned about trying to build a "spring spreader" to install the front spring. With the adjustable perches in place with the 2 nuts just started, there was NO tension on the spring, so I just tightened each nut down a little at a time going back and forth, and that spread the spring automatically.