hey, got some bar magnets, but they are too weak, and i wanna magnetize them more. How should i do this? I know it's possible with electricity or something, so i'm thinking of trying to wrap some wire around and making an electromagnet, that would probably aline the diodes inside the iron and make them stronger, but i don't know which way to connect ( + north and - south ?) If anyone knows that would be awsome... thanks a lot