Press out the bolt and take it to a machine shop along with an exact replacement bearing. They know what to do. It's very simple. Probably gonna run you around a hundred bucks-hopefully a little less-depends on where you live and how busy they are. It's cheaper to undercut it on a lathe, cold weld, and recut the diameter than to send it out for chrome or a nickle alloy and have to grind it back in. Good luck!