This is from Dan Neumann Race Cars on a drag racing forum.
Re: The official "magnetic brake" thread
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This thing works awesome for when I make my Lexan scoops. Built one today for a guy in Jersey and used the new brake for the first time with Lexan. It did a great job with it, in fact better than the old brake I used to bend Lexan. This is 3/16" Lexan.