Originally Posted by
rootboy
Wow Jim,
That's impressive. But, we're talking the adjustable cup here, right? Since it's the one on the LEFT side of the BB shell ...right?
Thank you.
No, we are talking about the fixed cup on the right side. The threads of the adjustable cup on the left are right-handed which means they screw in in the opposite direction from the rotating stress. Thus they will screw themselves in.
French BBs use right-handed threads on the fixed cup side too, which means they screw in in the same direction as the rotating stress. Thus they will screw themselves out.