Top or Bottom?
ITS the roto cup. i used to have that issues with my Nemesis.
The last few month, while i trying different limb set, i also have this problem. Lub the roto cup.
Make sure give it a good cleaning, and lub the bottom part of the Roto cup that contact the riser, and also the part where contact with the limb.
Once done, im sure u are good to go.....
Rytera Nemesis '10 - with Barndale's limb, Hutch~N~Son custom String and Cable Set, Sureloc Challenger + Viper Scope, Trophy Ridge Revolution, GoldTIP + Blazer Vane + Accunocks, Home Made Front Stab 28", and Side Stab 11", Carter 2 Special.