501X diffs - do we glue the diff rings?

[sim]

Hi guys, just a quick one. I'm running the 501X diff halves in my DB-01. Do I need to glue the diff rings to the diff halves? When I first built them, I just applied some thick grease to keep them there, and assumed the friction between them will always be more than the friction between the balls and diff rings. Now I'm not so sure because I'm having to tighten the diff quite a lot more than when I first built them to keep them from slipping and I'm not even sure what is slipping.