David, you can make one from memory wire. It is basically a curved piece of wire with a 90 degree bend, which slots into the hole near the 12 o'clock position in the case. Any ratchet wire from the 42mm range should fit. See one here on the right. If you do make one, you file the end to make sure the bezel lines up correctly.

Cheers
Stewart

: Have recently acquired a lovely Heuer Monnin Quartz that runs as it
: should but has lost its bezel clicks. When I removed the bezel
: there is a rather weak retaining spring but no bezel click ring.
: Does anyone know where I can obtain one, would it be the same as
: for a 1000 Tag Heuer for example.
: Any help appreciated