Here's a little something I'll offer to the list before flogging it elsewhere: I have a Campy NR Rear Derailleur with the Rally Cage modification as done by Spencer Wolf (SP?) of Cupertino fame. The RD has a patent 73 mark, but NOTE: the main body is BENT (that is CURVED) so I'm selling this as a spare parts donor to somebody who wants to modify their own NR RD, and/or just needs it for pulleys, screws, etc. I can sent pics. It does NOT have the main top mounting bolt, but everything else is there. I paid $25 for it and you can have it for the same, plus actual shipping cost to your address.
Thanks for the bandwidth, I'll have some more parts in a few days, too.
Alan Goldsworthy
SF, CA, USA