slalom44

If you have any concern about the magnets letting loose, get a rare-earth magnet. I picked up some Neodymium magnets last year, and I couldn't believe how strong these suckers are. I had two stuck together by accident, and I needed to use a vice, a large wrench, and all of my weight just to slide them apart.

If you happen to be scrapping an old computer, the magents used in the hard drive are Neodymium magnets. I picked up mine online from a place that reclaims used magnets.