I have a question about magnet recharging, sorry if im asking a dumb question i'm curious :P, i tryed searching on the forums but didnt see anything, what exactly does it do? How do you know when you need to recharge it? (i assume you test by putting a peice of metal near the magnet and see if it pulls it or not, i could be wrong..) Does it do any good to recharge a magnet when its already working fine? Thanks