Originally Posted by
choddo
If it was, and I guess from that comment, assuming the shell is too, why would they care if they’d put them in the wrong sides? Are they not identical in that case?
IF, if, if- Not all cartridge BBs have the axle centered WRT the frame centerline (usually called "symmetrical"). So if an Itl, threaded Bb was installed backwards the resulting chainline might not align as intended. But there would be no thread damage as in cross threading. Do know that because the drive side BB cup wants to unthread on it's own (epicyclic forces) some mechanics will apply a thread locker to that cup and if a strong version of this was used that cup would likely require far more force to loosen than usual. Andy