On my forth round of front der's trying to fix a shifting issue on a my Trek 750 project. I guess it's just part of the fun - but frustrating at times. In this case it was a 1991 750 with NOS Specialized touring Cranks (46-36-26) with 8 speed Dura Ace bar ends - started off with new generation FD and working backwords even tried a Suntour. expensive excercise - needed a front der with a totally flat cage - by process of elinination it has come down to a Pre XT Deerhead or a Shimano 600 FD # 6207 which I found online today for $32. This is my last ditch effort before changing out the cranks. I'd be interested in hearing others stories.
mw