Follow the link in my post, there are patent drawings and many photographs of similar devices. It wouldn't be too hard to turn an old stationary bicycle exerciser into one, I'd think. I've also seen grinders of that style, I'm pretty sure I remember watching Tubalcain/Mr Pete mess about with one on youtube.
as clunky as it appeared during movement the blade appeared pretty steady & smooth in action without cutting anything: cant help but think twyne could have made the process less chunky but then it would be similar to others & not original. His breath was less steady
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