Aside from brake blocks wearing out, the cable adjusting barrel assemblies can get in trouble and or are missing upon acquisition.
The part numbers originally were "barrel" #2009, "wheel" #2007, and "O" ring #2024.
I located at a not so local bike shop, Pacific Coast Cycles in Oceanside Ca, a set of new Campagnolo assemblies, functionally the same they differ in that they are made of Stainless Steel, have no identification and the cable housing bell is about 3mm longer than the original design, with a very short reduced diameter section without threading at the end, but they fit, have the O-ring and will tolerate salt air better.
Part #'s appears to be for an entire assembly, 1161019 on the small single unit Campagnolo bag, a slightly larger zip lock bag has the identifiers of BR9870 E212105 with the description of '00-'06 Campy adjusting barrel w/nut, followed by 186631200 and 7311 on the last line. The zip lock bag was probably a distributor part number.
I would assume that a shop who orders Campagnolo currently could buy these assemblies.
The price was very reasonable for Campagnolo, and while they will not win show points, fit the bill otherwise.
Also on display with a number of vintage lightweights, a Ken Bird, a Tesch 101, a Masi 3V from the Vigorelli and a 56cm Carlsbad GC, the price of the GC was $3,500. Most of the bikes were in the "middle size range, perhaps the Ken Bird was a 23" and had a tag of $850. if I remember correctly.
I did not get to talk beyond that as my son advised me it was time to GO, NOW! The proprietor did offer that he had worked for Masi Carlsbad at one point.
John Jorgensen
Palos Verdes Ca USA