Group---- Regarding Marcus Helman's question on the mounting of the Altenburger rear der. to the chainstay----- the top fitting of the derailleur is a channel shaped plate that fits over a (approx) 1/8 x 3/8 x 2" long plate that is welded directly to the stay, and attatched to same with two small screws/bolts. I could supply photos of same if I knew how...
Nelson Miller // Seattle WA // USA