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The double bearing cup is a tight fit and generally requires a puller such as in Tom Endy's tech articles on The Santa Anita A's web site. If it has spun in there then it may not be practical to repair it. I'm not a big fan of using Loctite on something that large since it depends on what the clearance is. Loctite 600 series cylindrical part locker can work on clearances as large as .015". The caveat is that it may be difficult to disassemble at next overhaul. It will have to be completely clean for the stuff to work but it's going to be the only way to tighten that set up up enough to avoid complete disassembly of the rear axle. Make sure the tapered bearings are still smooth to operate with no sign of shake or looseness. Preload is likely not what it was at last assembly due to bearing wear. Preload on used bearings should be less than new bearings but it may still have some preload depending on how long it ran before the double bearing cup started to spin.