So far I’ve practiced on probably 15 old beat up Knives who’s blades have it been in fairly good shape I’m trying to sharpen the blades and I have yet to not scratch with just one scratch every plate. I tried to sharpen as careful as I am I always put a mark on the blade of some sort. Is there any way to do this? It seems almost impossible. I have used Whetstones. I’ve used him shirt by design I have used just about every way there is to sharpen a knife, diamond sided or whatever but I just can’t find a way not to scratch or put a scratches even a small scratch on a knife and that ruins it if it’s a knife, you want to sell it some point, any advice it would be much appreciated. I’ve found that this is a very knowledgeable audience. Thanks.