Sharpening pinking shears is an art, so find someone who Knows about them, not a lawnmower repairman. My Mom sharpened hers by cutting Very fine sandpaper. Another woman I knew used emery cloth- same principle. Sandpaper grit and emery are made from ground garnet. Can't recommend it unless someone here knows if this is good to do. A drop of sewing machine oil (Not 3-in-1) or TriFlow would benefit the screw. Work the scissors several times, then let them set a few hours and wipe off the excess.