I have a Gitane Champion (presumably it's a 1985) and it is equipped with a "Gitane Chrome Standard" headset (per catalogues) and if you notice below, the headset has a locking nut on top, followed by two spacers, followed by the adjustable or top bearing race. Locking nut takes a standard 32mm wrench but it simply will not turn. The locking race on this headset has only a knurled surface to hold while applying the tool to the locking nut. In my experience, top bearing races usually have flats to allow a wrench to fit or holes that allow a tool to lock in and give purchase while the locking nut turns. Presumably, I could wrap the top bearing race in duct tape or similar and apply a pipe wrench to hold it while I try to turn the locking nut. I can't believe that this is the best solution.

I've run into this previously but can't recall what I did. I tried searching "headset with knurled bearing race", etc but no luck.

Any ideas? Any specific tool(s)?

My headset





Sorry for the close up, headset looks worse in photo than real life!

Online photo showing same headset on another 1985 Champion