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@SSSasky
The don't have a patent on it (AFAIK). They're just the only company willing to put the machining time into producing them. You can find instructions for making your own using basically the same design, but I think for most people it makes more sense to just buy it.
I had one. It worked, but I didn't love it by any means. I eventually replaced the frame with something with horizontal drops and changed the axle to a non eccentric. In future, I will simply always use frames with some sort of tensioning system built in. There's plenty of good, cheap options out there.
I also have one of their freewheels. That, I love.