I didn't and havn't had any problem. The angle it sits at is leaning back so it should stay in there pretty good. If you think that it's just a problem with the ring I'm 100% sure DaveB will send you a new one.
surprisinly mine fit good. it was a lil loose but i just kepr rubbing my finger around it, and when i flipped it upsidedown it didnt even come off. I guess i got special rings
I didn't use ANYTHING on mine....just pressed them on real good....wiped my fingerprints off of them and stuck the whole thing back together.....and they are still there.... (stash)