Apply heat to the nut on the rear radius arm stud. This will help the nut to expand on it’s threads and break loose from the stud.

This is typical of most radius arm corrosion damage. It’s to far to thin to reuse and the threads semi stripped when the nut was removed.

It never hurts to have a willing slave eager to work off the cost of a new Playstation 3 game.

You can spray a little WD40 if you want, it will smoke because of the pre heat, but help the nut come off without damaging the threads

Grind out the weld on the outside of the radius arm.

Remove the lock nut while it is still hot.

Grind out the weld on the inside of the radius arm and drive out the old stud.

Old and new stud.

The bushing that appeared to be good before disassembly definitely has separation anxiety issues.

Here is the other problem you can look forward to. It is common for the spring seat mounting bolts to snap off. Take great care in removing them.

Check the backside of the radius arm drop bracket and make sure the sleeve is still square and not worn at an angle.

Remove the old bushings and inspect the holes in the radius arm yoke for damage.

Check the other side as well.  It is common for the stud to wear down into the bracket and wallow out the sleeve.