My BB has a habit of wobbling even when both cups are fully inserted and tightened. The BB itself is in perfect condition, so it's not that. A guy I ride with thinks it's the frame's threads are allowing the wobble. To counter-act this, we used plumbers tape to create a better seal, but eventually the tape is worn out, and won't stop the movement. The frame is a matte black Ozonys Cannibal( rear disc mount, vertical dropouts, not sure how old) and the BB is a Try-All ISIS 127.5 mm. Any ideas on how to solve this problem. I want to be able to screw in the BB and leave it there for over a month without movement.