Originally Posted by
Vintage_Cyclist
You need a step-down ferrule. One end is large enough for the cable housing ferrule and the other end is small enough to fit into the cable boss. That probably steps down from 5mm on the cable housing side to 4mm on the boss side.
actually,
shimano is 4mm
campagnolo is 4.1 mm
i think
just bought some campy step down • steel
and shimano step down alum.
the old campagnolo wound wire is 4mm
and then again, i could be totally wrong