Shimano 600 front derailleur problem
The unit is on a 1995 Trek carbon road bike. I flick the index shifter, integrated in the brake lever, over to the large sprocket. No problem it goes. Click to return to the small sprocket and all that happens is the cable gets tighter. Set screw is set correctly, as there is space, but the derailleur does not budge. No rust, nor corrosion, lubed but something is not allowing the return as the lever will not go all the way over and click and return. It feels like the set screw is tight at this setting so nothing happens. Any ideas?