Castor pills came out after I quit building, so have no experience, do you have a drawing so I can figure out how much castor/camber they add. After I stopped driving and building, I remember seeing castor pills in other karts, and I always wondered how much change in castor/camber they could achieve. You realize of course, if the offset is at 90° to the frame rails, you can change the camber, if they're in line with the frame rails, you can change the castor, rotate anywhere in between, and your changing both. I've never thought that was a solution to any problem. I'm pretty sure they are a feature that helps selling karts.