Hi all.

I am installing a front derailleur, a shimano fd-6400 (aka 600) braze-on, paired to a dura-ace brake/shifter from the same year. the cranks are also shimano 600. I'm running 8-speeds in the back, and front is a double ring. I'm putting them on a new-ish scattante frame.

Here is the problem I've run into. It seems that the shifter isn't pulling enough cable to fully move the derailleur.

I started by having the chain on the small front, and large rear cogs, then adjusted the lower limiter on the FD to be 1mm clearance. Then tightened the cable, and used the downtube adjuster screw to take up any slack. Then I moved the outer limiter screw way past where it should be (so it shouldn't allow the maximum amount of cage movement). Then I shift the chain to the large front/smallest rear cogs, and the front cage is rubbing the chain. I can pull on the cable and the FD has plenty more room to move, but the shifter just isn't pulling that amount of cable in one full shift.

The shifter came off of a bike that was paired with the same crankset but a FD-6401 clamp version of the FD. and the fd-6400 is a slightly different design, with the parallelogram at an angle, instead of being perpendicular to the seattube. Would this account for it? seems odd, since why would they have a different shifter for a braze-on vs. clamp type FD?

How is this possible? is there something wrong with my shifter?

what am i missing?

please help.