I wanted to recommend one that isn’t listed in the article. Thisis literally the best hand held knife sharpener I have ever used (admittedly I haven’t used that many, but this one does the job incredibly well).$17.49 at this specialty store that has only quality products. Mightbe cheaper elsewhere, but I buy sausage making supplies from thesefolks. Also lots of things for making cured meats at this store. https://www.butcher-packer.com/index.php?main_page=product_info&cPath=67_74&products_id=166&zenid=d9fb9fd1719a742f4cb081da4aa5baa7