Oakleaf has a good suggestion with the antiseize.

Most SRAM derailleurs I know are not designed to pivot in use.

Most Shimano derailleurs I know are designed to pivot in use, and you'll get better shifting if you can figure out what's keeping yours from doing so. I've taken this pivot apart in the past, it's a little tricky to wind up the spring on reassembly but after a few tries I got it. Might help to have the Shimano TechDoc exploded view for your derailleur as a guide.

Trivia: The lower pivot is the "A" pivot. For nearly the last half a century it's been a sprung pivot in 99.9% of derailleurs. When Shimano added a spring to the upper pivot (in the 1970s?) it became the "B" pivot. That's why, to this day, the screw that adjust the angle of the derailleur body at this pivot is called the "B-tension screw"! (Some Campy derailleurs adjust at the "A" pivot but I don't think Campy calls it that.)