Loose screws are the main adjustment for doors whether it's the hinge , the strike plate or the knob they should all be tight , but sometimes the holes have worn and they need to be filled for the screw to gain a bite . This is easily done with a kitchen match or two and some glue . Just put a drop of glue on the match , slip it in the hole and break it off , then put the screw back in . On the hinges and strike plate it is sometimes nice to replace one screw with a longer one that will reach into the wall stud . If the door is split you may need to inject the glue into the crack and clamp it . If a panel is missing you may need to replace the door or get creative . If the house has settled you may need to cut or plane the door .