Just serviced my BB7, as I knew it could feel a lot better with my current set up. Got it all apart fine, following the overhaul guide on the Sram/Avid website. To my suprise, I only had 1/3 ball bearings in it! I found some others that are a little bit smaller than the standard ones, and they seem to work ok. It feels a lot smoother anyway. Got it all back together, only problem is the red dial wont stay on? I've tried just pressing it on, but it's not having any of it. Help.