If anybody's interested, I made another batch of two-soded mounting bolts for standard cantilever or classic Mafac brakes.
see: http://www.flickr.com/
They are one-piece, machined, stainless steel with acorn nut.
Can be used to mount TA mini racks on Mafac Dural Forge, Racer, Competition and 2000 centerpull brakes, or on almost any cantilever brakes, both classic and modern.
see http://www.flickr.com/
These are $15/set including shipping (paypal only).
Amir Avitzur Ramat-gan, Israel
BTW: would be happy to trade for Mafac small parts.