I have seen plane blades flattened on the side of a Tormek wheel. It was commented that this is very aggressive and you may not want to do this with say your LN blades. Well, I would say that you probably do not need to place a LN or Lee Valley blade on the side of the wheel because they are already plenty flat. By the time you get them, all you really need to do is polish them, so, you may consider using the leather wheel, but try to not round over the top as you do so.