1sgt, I don't think CA glue would be anymore strong than a thread locker. At least when I've used thread lock for metal to metal bond, I've had the worst time backing it out over using just a dab of CA.<div></div><div>As Don stated, do check for cracks or faults in the hole. Those plastic screws do a fairly good job of staying put, so there may be other reasons why it keeps backing out. If there is a crack, use a small amount of epoxy putty to fill the hole so it fills any cracks or to just minimize the diameter of the hole, with a wet screw (so the screw doesn't stick to the putty) screw it in the putty filled hole and then slowly back out the screw. That's one solution.</div>