Originally Posted by
ArchaicArcane
The front one isn't just stuck because the back one is in a position that doesn't let it move? Try one of the "middle" positions and see if the front moves. The good news is that video works for the front selector too. It will look slightly different, but all 4 parts are still there to work and oil. Perhaps the front got jealous for attention....
It can be a dab of dried up oil anywhere in the system - yes and if the other selector isn't seated they don't move well. Usually if they don't seat well there is still dried up oil somewhere - pesty dried up oil.