Just a question: You do realize what part of the die is affected on die polishing? Clashes happen on the fields. Die polishing is on the fields. Why? Because the die is a negative of the coin it creates. What is raised on the coin, is just the opposite on the die. It is incuse. So when you mention die polishing on the feathers, this doesn't happen. Die polishing is only on the flat surface of the coin the fields. Die clashing only damages the flat fields on the die. The outside edge of the die. The devices are deeper into the die. so they never touch. So the outlines of the devices are the only points that make contact and can be altered during a clash. So when I show the overlays usually just the outlines are affected. But there are times when the area around the ear/neck area where there can be clash marks because the area is close to the field height. (or close to the surface on the die, The bays on the memorial are part of the fields because they are the surface of the face of the die. The eye on the Washington nickel are part of the area that is close to the surface on the die. In most coins where see heavy die polishing are very close to the field/surface of the die. Thus we see roof lines missing, eyes and notes areas missing from over polishing. So I wanted you to realize that the feathers are not part of the field and don't get altered when a die is polished. Hope this helps.