Lares is one outfit that rebuilds steering boxes. I think it has to go thru another vendor who sends them to Lares for rework. But
click here for their contact info. I did mine myself, but it was mainly a cleanup and reseal. Jim Carter sells replacement worm shaft and nut assemblies, as well as sector bushings and seals.
I also rebuilt my door hinges. A drill press would have been handy for that, but I don't have one. Succeeded anyway. If your hinge pins are seized in the straps that go into the door, it'll be a bit harder, but still do-able if you're reasonably handy. But I'm not in the business of rebuilding them.
