Looking for a adjusting barrel nut for a Mafac competition brake lever. It may be the same on other levers, but I have no idea. It screws into the lever body, and the adjuster then screws onto this piece through the brake hood. I just found out one of mine was missing on my old PX/PS whatever it is, lol. Looks like a hollow double ended stud with a nut in the middle.,,,,BD