I'm puzzled about a Huret Jubilee rear derailleur. Obviously, it is designed to be mounted on a claw, with a back-up nut. You apparently can't mount it on a Campagnolo drop-out; you can't tighten the mounting nut, or the derailleur won't swing forward and back, and there is no way to use a back-up nut as with the claw.
Apparently, it is possible to obtain a special mounting plate so the derailleur can be used on a modern drop-out. There are some pictures of Jubilees with these on the CR site, and I've seen a couple on eBay. However, the view of the plate is obscured, and I can't imagine how this would work. Is the plate threaded, so it acts like the back-up nut (although on the front side of the hanger)? Or is there some other arrangement?
I've little hope of finding a plate, but I'd consider trying to make one if I can figure out how the whole thing works.
Thanks in advance--
Steve Maas
Long Beach, California