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@retrodicorsa
^ Hang on a mo' what I've said IS true, you've just said the exact same thing but the other way round - read what you quoted from me: "face if the BB is not a sealed cartridge type" is the same as what you're saying: "you need to face a b/b shell is when installing the "new type" (Hollowtech II) external bearing cups"! In actual fact you are 'wrong' because strictly speaking you should ALSO face when using any type of BB where the two bearings are not physically joined together which includes the fancy/traditional NJS type like Sugino 75s etc. with separate races ;-)
p.s. 'sealed cartridge type' means any BB where the two races are joined in one piece, like the Miche, Shimano UN series, modern square taper Campag etc.