OK, it looks like I only have one spare der, not two

Upon further review (it took a while), my old derailleur cage is bent. It looks like it's not, but the teeth of the two pulleys don't line up, so something is messed up. A buddy of mine (Matt) who works as a wrench in the Keller shop told me that you can replace the cage, he even showed me the part, but he said that it's a pain in the butt. Actually, he said it was a *itch, but I don't like using that kind of language. Maybe if he had said that it was a positively craptacular way to spend an afternoon, I'd post that. But instead he said bitch. Doh!