from what i remember that bolt only locks the back and forth or side to side movement not the up and down. it has been a long time since i worked on a vent window so it is a little fuzzy. any chance that the bolt threads has rust on the back side and it is not allowing it to tighten down all the way. but to answer you question about gluing it i would not. before i did that i would drill a hole and put a screw in it. sorry if i can`t be of more help.