These plans are for the Negative Rake Scraper seen in my You Tube video on this topic. To make it I re-ground a straight edged scraper. It was a tool I had and was prepared to re-shape. I did the re-shaping on my 8″ bench grinder and took it slowly. Don’t try to do all the grinding in one go unless you have a wet grinder. There is too much danger of burning the steel and altering the temper (steel quality). I re-ground mine over a couple of days giving the steel time to cool down between each session.