For those of you who read about Dave's Riviera (spelling?), and his fun with the TDF mech and would like to find out what it is like, I have some for sale. $110 including airmail to the US.
Boxed, NOS, with instructions (in French!), shifter (band on) and cable. They require either a plain rear drop out (no hanger) or a Simplex type rear drop out. If you really want to go for it I can sell you some fresh Simplex drop outs and Brian will build you a frame FOC. Well maybe not that last bit!
Regards Martin Coopland, sun is shining in Scotland and I am off to walk my dogs!