When a magnet comes loose inside the flywheel, it can be Super Glued back in place. But first, be sure to thoroughly clean both the flywheel and magnet (use cleaning solvent or paint thinner to dry out any oily residue), and make sure that the poles of the magnet(s) are in the right postion. North-South-North-South-North-South-North, etc. To find which poles are north and south on the loose magnet, tie a string around the center of the magnet and allow it to dangle in mid-air. The poles will attract to the natural magnetic poles of the Earth. Then write on the magnet which poles are which. Then, when installing the magnet in the flywheel, be sure the poles are opposite of each other. If they attach, it's in the right position.