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@Juicy8
As above, new Campagnolo square taper BB which turns perfectly smoothly when uninstalled, turns in quite a notchy way when the cups are tightened up in the frame. The threads are fine and the previous BB worked perfectly. The only difference between the two BBs seems to be the new one has a lip on the driveside, where the old Miche Primato BB was flush with the BB shell.
What could this be? An uneven BB shell requiring facing??