Well, I took the old school approach, since when grinding with a power tool by hand it is very easy to make a mistake that can't easily be fixed. They cut so fast that a little error quickly becomes a big one, especially when you're working on a near razor edge. I used hand held coarse diamond hones to reshape the dull edges and then brought them up through finer grit to something like 5,000. I also took them apart and did one side at a time, fitting them together as I went to make sure the edges lined up parallel with each other and closed correctly. It ended up working out great. If the cutters didn't come apart it would be a LOT more difficult, access would be a problem. A tool and cutter grinder would really be nice, but don't have one of those. I have also sharpened knives and straight razors for quite a long time and was a machinist and tool & die maker for a couple decades, so it might just be easy for me, don't know.