Rolling knives sharpener

Rolling knives sharpenerTo assemble it you need 2 pcs of 6004 Ball Bearings preferably covered (6004 2RS), 2 pcs of O-Rings 55x4, 5 pcs of circular magnet 15x3 plus sharpening stones like these for examplehttps://www.aliexpress.com/item/1005007186994693.html