5 Amazing Tricks With Magnets 5 Awesome Tricks With Magnets Tricks from this video: 1. Homemade compass. For this trick you need needle, piece of cork, magnet, plate and some water. You need to ...

Me too. My first thought was two magnetic read heads, one at 1/4 from the top, and a second at 3/4, but that does not work with the control characters, which suggest 3 magnetic heads.