Doing a restore on a 10-speed, 1983 Schwinn World curbside find with stem mounted friction shifters. This bike has Shimano components. After a thorough cleaning, degreasing, new cables and housing, the following problem. The rear derailleur works fine, but the front derailleur will not move the chain onto the large chainring. I can't even move it out far enough by hand. The chage is not bent, it is aligned vertically and horizontally and adjusting either or both limit screws doesn't help. What to try now or is it time for a new derailleur?
Tsapp