i have made a few .trying to get set up at home the boss dont like it when i make them at workgrin .i work at a machine/weld shop that has been open since 1965 .there is a old file on every flat place in the shop.they have been getting a free ride home often grin. also using old blades off of timber cut down tractors ar 400 plate we cut it to size then sharpen it in a mill .it stays sharp good