I'm speaking for BBs that use the design which in effect have the outer cups pressing against the centre distance collar to create the tightening torque. Ones like Campys present generation of BBs, back to the older models that didnt carry a lip on the RH side cup, aka C-Record versions. In these BBs the torque setting of 51 Ft/lbs is what keeps it secure in the shell and it can be moved from left to right in the BB to fine tune the drive line. Granted the newer Campy ones now have a RH cup lip, but ive removed this many times in a lathe to allow for a better drive line angle or to get the arms even by the chainstays. A similiar thing can be said for the FSA Mega-Exo outboard units that are made for a 68/70 wide BB shell. On a 68mm shell you use the supplied O ring on the left side to hide the LH cups exposed threads, but you can also move the bearings those 2mms left or right in the shell too if need be and then torque them against each other.
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