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@lae
^ or remove the adjustable cup, mask off both axle holes from the inside of the cups, then re-install the adjustable cup and mask off the exposed thread and put something into the pin-spanner holes so they don't fill up with powdercoat. Or just mask off that whole cup.
If you can remove the adjustable cup it's not a problem really. You don't need to remove the fixed cup unless it's worn/damaged or you want to change the entire BB i.e. very rarely.