I've also had a Sunlite repair cartridge loosen up on me in a Raleigh bb shell. I drenched the threads in blue loctite and tightened it as hard as I could, and that seemed to fix the problem... haven't seen the bike in a few years though, can't guarantee it didn't loosen up again. Another unprofessional repair I've seen work on a Raleigh is to face the bottom bracket shell to 68mm and run a normal bb tap through it, then install a cartridge bottom bracket. It tightened up nicely with no sign of threads pulling out.