I have a pair of 1980s Shimano 600 brake calipers that look very similar to this
Sadly the cable barrel adjusters have gone missing. I thought they'd be easy to find on ebay but I'm not sure exactly what I'm looking for and some of them seem to be selling for several times what the calipers are worth!
The hole in the caliper arm that should hold the adjuster is not threaded internally. However, it is partly flat so the hole is not perfectly round. Could anyone suggest where I could get such a part cheaply, or a formal name for it that I could use to help me search? I'm not bothered whether it looks retro or not.
Looking at pictures on line, it looks as though sometimes there is a nut above and below the threaded barrel adjuster and sometimes only above it. In the latter case is the adjuster held in place only by the pressure of the cable outer above it?