Originally Posted by
Mr IGH
Because the external LX BB is made for both 68mm and 73mm, you can play with the washers to set the chainline to either 50mm or 47.5mm. If you have measuring calipers it's not hard to figure it out the correct combo.
Bringing the right crank in will push the left crank out an equal amount, right? Is Hollowtech II centered already?
If re-arranging washers does make the whole assembly off-center, I'd want to weigh that against getting the desired chainline.