When we did my brother's injectors, we had one little b@$tard glow plug that the socket got stuck on. All the others came out just fine after we loosened them and then used the hose on to get the rest of the way out. Even after he tightened the glow plug back down the socket was still stuck and we gently had to wiggle the socket loose with a pair of small needle nose pliers. Then we were finally able to loosen it and pull it out with the hose.
Ohhhhhh I can totally picture that. Been there, done that. Theres always one that needs the needle nose treatment.