How difficult is it to do filework by hand on a razor? Or should I try a dremel? I have a Torrey that has about a half inch long and an eighth inch deep area of severe errosion/pitting on the spine. There is a significant loss of material there. I figure the only way to hide that kind of damage would be to remove it artfully. Like with some of those cool spine scallops I see on older razors.

So, hack away at it with a nicholson file, dremel, or take it to the grinder? I've read filework guides, but they tend to be focused on small pretty little patterns using diamond files. I need to move major metal here and tiny diamond files aren't gonna cut it!