Set screws are those tiny fasteners that hold everything from doorknobs on their spindles to wall-hung toilet-paper and towel hooks on their brackets. But some set screws just won't stay set. Try applying a drop of Loctite Threadlocker Blue
to the threads and reinserting it. "It's a superglue-type adhesive that's strong enough to keep the screw from vibrating out, but will easily release when you want to unscrew it," says Norm Abram. No glue will help if the threads are stripped, though. In that case, wrap some sewing thread clockwise around the screw's shank before putting it back.