If you're ever needing to apply big torque to one of the old, 38mm, eight-sided Stronglight fixed cups, know that a 1-1/2" twelve-point socket works really well in conjunction with a 1/2" breaker bar.
This got a stuck cup out of a fine 1950's Cattaneo-built, private-label Urago frame not too long ago.
Such sockets are often hoarded at pawn shops in their big buckets of sockets, might cost only a few dollars like mine did.
Be sure to reduce any deep bevel at the socket's 12-point opening, grind it flat if you can.
