This is the stone I am currently using, 8k(3 micron) diamond. Made by sprinkling diamond dust on a steel block while electroplating the steel with nickel. The

This is the stone I am currently using, 8k(3 micron) diamond. Made by sprinkling diamond dust on a steel block while electroplating the steel with nickel. The nickel holds the diamonds on pretty firmly so it lasts a long time if you do not abuse it. Cost about $80 https://www.sharpeningsupplies.com/8-Extra-Extra-Fine-Diamond-Stone-P125C24.aspx https://www.sharpeningsupplies.com/8-Extra-Extra-Fine-Diamon... In the past I have used fiber optic polishing film, it works and cost around $1 a sheet. It must be stuck to a very flat surface like a glass table or your bathroom mirror. You want something in the range of 1-10 micron. https://www.ebay.com/itm/114106443536 https://www.ebay.com/itm/114106443536