Per Dennis's instructions, I tightened the h*** out of the alternator, so
that I could turn the alternator nut and make the engine go round. The
alternator is now at the very end of the bracket, no more room at all for
further tightening. And guess what? No more squeal.

So thanks Dennis (once again.) But I have to say, I am not comfortable with
the belt being that tight--it's tighter than I've ever run one, much tighter
than the other two, and I'm thinking that bearing isn't going to last. But
we shall see.

As far as the drive pulley goes, it's definitely wobbling, and I never
touched it. I noticed this a long time ago and just didn't think anything of
it. It's been on there the whole time I've had the car, about 25,000 miles.