I use a DMT 325 for lapping. I have had it for a while and it is now quite smooth. However, there are one or 2 imperfections on the surface. These are small but seem to scratch the hone when lapping. You can actually feel a slight drag when the hone goes over these spots. Is there any way I can get rid of these imperfections? They seem to scratch the hone when lapping, but this doesn't seem to have any effect on the stones when honing.