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That other one is pretty cool too, but it lacks the nice feature of being able to set it on the counter and let ‘er rip! :-)
This one uses a battery, a magnet and a drywall screw – same principle but even easier to make…
http://www.farmgeek.co.nz/?p=22
Probably magnets. I wonder how long it can turn before running out of batteries?
I’m guessing those are magnets, pretty cool
That’s damned clever! What is it that the battery is sitting on? Looks like a watch battery, to be honest.