Here's what happens when you slam a sagging door for a few years...
This is how it's supposed to line up:
Back when I lived in an apartment and didn't have anywhere to pull the door apart, I tried hammering the guard down around the shaft. This doesn't help, because the guard isn't what failed. That hole doesn't really support the shaft. The real bearing surface is a punched hole in the larger stamped piece that attaches to the door. A few years of abuse and that hole goes out of round, I doubt there's anything that can be done to repair the part. Between the spare doors and spare door internals hopefully I've got a good one, otherwise I'll figure out how to turn a rear into a front.