I had the two top side screws back out a tad once. Not sure why they would. They are extremely tight going in and out. If you have an extra cap head screw, take a dremel and cut a small slot into the threads of the screw at the end. Screw it all the way in and back out. Then put the original screw back in and it should be much easier. Some pink thread lock would be a perfect candidate for this application. It's a little less powerful than blue, just enough for some stick.