Here is a copy from an old thread
Doug, the 5206.2RFC3 bearing has been the main staple for umpteen years, and as you stated, it had to be installed correctly or you have a dire problem.
The new bearing...3206.2RFC3 does not have a loading slot and can be installed without consequence. This is the bearing that RAF installs in the rotor head. This is also the bearing I had AAI install in my modified dual bearing rotorhead.