That washer idea is pretty good if u can get it to magnetize, it is def possible I have done it with screws and what not but now that I think of it, that won't make the washer a magnet, it will only magnetize it meaning it will only stick to another magnet not create something that will repel or stick(unless to a real magnet). Ur best bet wud to get a magnet to replace it or another mod wud work of course