errrr, no, I’ve explained it badly, no sleeve at all, hacksaw is to remove part of the cups, because top of the shell protrudes into the cavity. Dura ones don’t have a sleeve at all, so don’t have that bit of plastic getting in the way.
Go here and zoom on the bb shell you’ll see the bit I mean, its solid and goes right the way across. Man from importer on the CommencalOwnersClub (useful site) swears its makes it loads stronger, seems plausable.
awesome bike though, just had a short ride on mine (not properly finished), hitting stainburn next week, can not wait.
EDIT: dura ace road is what I mean sorry, these will go in unmodded.