I've had that kind of problem happen a few times, and I've never been able to fix it with out taking the aileron off. It's just too hard to inject enough epoxy in there with out gluing the aileron solid. It's not that hard to cut the hinges and reinstall with new hinges and a nice dose of epoxy in the torque rod hole to prevent the movement. Taking the aileron off also allows you to scuff up the torque rod so the epoxy sticks better, and clean the area up nicely if the plane has been flown. It's not uncommon to have oil or dirt in there.