Hmm, I think this may be it. I hadn't applied a slathering of new grease when I was putting the cartridge bb back in, as I had just spent so much time cleaning it out and just wanted to check fit. The other external BB that threaded on so nicely have never been mounted before and I think they had a thin coating of factory lubricant.


Thanks! I'll obsess a little more before the package comes and may do some testing before hand.