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I personally have never seen one as they are not a very popular machine around here and I think fairly expensive.
I have heard of a couple people that use them and frequent this forum so just give them some time to see this thread. It might take a couple days but I think you will get the answer you are looking for.
Since they are not that popular there might be better machines that are more popular. For a hand powered device, the Edge pro Apex/pro are very popular and get great results. I have one and was able to get a mirror hair splitting edge the first time I used it. For a electric powered design, the paper wheels are popular and also work very well. I also have these and can get hair whittling edge is just a couple minutes.
Good luck.