WTD Campagnolo Chorus brake cable tensioning bolt.

[hairychested]

I need a couple of those so I can ride with brakes rather than without them. Similar to the item circled in the photo:

Photo belongs to don simon off STW, please respect his ownership.

 

[hamster]

Mercian do these as spares.

 

[Uncle Buk]

Also Campoldy is an option if you are after period Chorus ones - I think Nigel still stocks a Record version.