I remember now what was my technique to free the stuck barrel adjusters :
(1) Put 2 opposing nuts onto the end of the stuck barrel adjuster bolt.
(2) Clamp the adjuster's round nut into the plastic (nylon) grips of a panavise.
(3) Grip the barrel adjuster bolt via the opposting nuts, and rock the barrel adjuster bolt. meanwhile, spray with WD-40 and dig little specs of rust out from within the barrel. Pay particular attention to the flats of the bolt as this is likely where the rust has grown and where it is fouling the threads. Every time you rock, dig a little bit more with a safety pin.
NOS Campy Barrel Adjusters are hard to come by. I think someone a few on ebay a few months ago, and they were gone in minutes. I have 19x new Chorus adjusters in my garage that I am reshaping as nuovo-record adjusters for a group of CR members who are restoring old campagnolo brakes ($12/ea).
- Don Gillies
San Diego, CA, USA