Was doing a fluid change on my trike when I noticed the oil plug looked crooked. After inspection the magnet came right off, kind of scary since it would go no place good. After some research for replacement plugs settled on these Dimple magnets replaced all three. They really do pick up a large wrench where the H-D ones wouldn't even hold them self up. Anyway I figure the price is worth piece of mind. Thought I would share.
http://www.cyclesolutionsonline.com/_e/gdept/25/Magnetic_Drain_Plugs.htm
http://www.cyclesolutionsonline.com/_e/gdept/25/Magnetic_Drain_Plugs.htm