^ interesting.. i didnt know 3mm was standard on the FB's. Thats good to know. Im assuming the rotor is damaged since he needed new housings.... but i could be wrong. But the common theme here is that you gotta open it up to see whats going on.... And people re use apex seals alot. I have even heard of guys re using bent apex seals after they hammer em back out... So, get in there and see whats going on. Also, there are 3 seals per rotor, as landon was getting at, you should check compression on all three sides of each of the 2 rotors. That will give you a better indication of the seal being bad.