I know there r no stupid questions, but this is a stupid question none the less. I used my Izula today to shred up a half inch thick role of cardboard I got from work. It is kinda like a 5 foot long toilet paper role, only a half inch thick. I guess this is kinda consedered hard use. It dulled my edge a little, which surpised me because while verry dense cardboard, it was not wood. When I was cutting chunks out of the cardboard I was kinda pushing the edge if u will, running the ege from tip to handle. I usually pull the edge running it from handle to tip, but I had better cutting ability pushing the egde, cutting with the belly of the blade. Is this bad on the edge, or is this ok. I did not dull much, but was not sure if this was normal or not. I was using these cardboadr scraps to mix into dryer lint to make a good fire startter for my firesteel.