Campagnolo BBs that have been looked after and have not corroded are often not too hard to shift. I might try a single-hook lock-ring spanner.
VeloSolo have various ones - I'd go for the Hozan one (which I have) first, as it has two ends of slightly differing sizes, so you get two chances at a good fit, but take your pick.
The following tools all come from
SJS Cycles, though there are other suppliers:
This Shimano spanner would probably fit Campagnolo - in those days, quality six-notch lock-rings were pretty standardised. Try asking the shop before buying:
This Park Tool would probably remove your fixed cup and fit the pins on your left cup:
This adjustable Park Tool would definitely fit your left cup:
Or another adjustable pin spanner from
Winstanleys (and others):
If the BB is hard to move, the sneaky trick with a bolt at the bottom of
Sheldon Brown's page will work on either cup. I used it last weekend with a recalcitrant Campagnolo BB to force a spare cup in and out of the threads until the cup moved freely, as it should.
By the way, watch out - some Campagnolo BBs had alloy cups. Obviously, these are much softer than steel. This was true of the one mentioned in the last paragraph - but again, the bolt method removed the stuck left cup with no damage.
