A friend just bought a s/h bike for his wife with full 10-speed Campagnolo Centaur groupset at a nice price. When he got it home he discovered that the 'button' or barrel' in the LH brake lever blade was missing. Is this part replaceable? Or will he need to replace the whole lever blade? And would anybody happen to have the actual spare part?
You can see the button in the 'closed' position in this photo:
and I can't imagine that the QR button is different for the different models.