The other day my son happened to use my nortons for his hunting knife. I did not think it was that big of deal as that I to use them for my knifes at times. I am not sure what he did but when I went to work on one of my razors I noticed he had dug scratches into the center of the stones. I lapped out the stones until the deep scratches in the center was gone, however, now I find I have scratches all over my 4/8K stones that will not lap out. I scrubbed and cleaned my lapping stone but that did not help either. Does anyone have an suggestions?