How much do I tighten those 8 little bolts that hold in the 3 (steel, rubber and felt) gaskets in the inward side on the knuckle? It seems like the half circle gets a little wavy and it doesn't stay flush inbetween the nuts. It almsot seems like I'm over tightening them (kind of like an oil pan gets warped when you over tighten the nuts). I compared it to the other side, but they seem tighter. I can't tell if the outer ring is warped on that side because of all the caked on grease/dirt.