i think the only thing that matters though is how much force it takes to turn the knuckle (12-15lbs. i think), the shims adjust that.
Not true. I believe the bottom ones are used to center the knuckle, and the top ones are to set preload on the knuckle. I am pretty sure thats right... maybe not. I think OOPS explained it to me once. That being said, I did one thick and one thin on both the top and bottom, and it all worked out just fine.
