I just took apart my opti because my car is missfireing,bucking,backfiring through the intake/exhaust. I took apart the opti, and this is the only part that might look suspect to me.

Hows it look?

 

Fuzzy.

Sorry, I'm not very helpful.

For future reference, take close up pictures (<12") in Macro mode if your camera has it. It will focus better.

 

Its a camera phone, I cant get it to focus any better.

 

Hmm, theres corrosion on the points on the cap that I didn't see, it flakes off with my finger nail.
Here's a better pic of the rotor, I cant get my camera to focus on teh points though, so that pic is pointless. The corrosion flakes off with my finger nail though, so hopefully that was causing my miss. And on part of the rotor, its shiney, almost like it was making contact with the points.