Wasn't aware of it either. Chris has video where he shows how it can be used to create a smooth edge on a card scraper (prior to burnishing): https://vimeo.com

Wasn't aware of it either. Chris has video where he shows how it can be used to create a smooth edge on a card scraper (prior to burnishing): https://vimeo.com/154986086 https://vimeo.com/154986086 I find that file alone is quite enough for me but it does look really nice use case. Would imagine it could be handy sharpening hard to reach places. Also, while Chris isn't recommending it as a general tool for sharpening, I can imagine the name "Universal Sharpener" could lead people to believe it's a good choice for general purpose sharpening.