Rcav8r, I don't think I'd be taking a grinder to it. Fleshing knifes are sent out sharp where they are suppose to be sharp. They aren't sending steel blanks for you to grind your own out of. You will more then likely ruin it.
Some fleshing knives have only one usable edge. The blunt edge on a double edge knife will be square. Meaning sharp corners but perfectly flat on the edge. It's the sharp corners that do the job when scraping fat and meat off.
The sharp edge is for shaving, thinning, or really stubborn meat and fat. And it is very easy to trash a pelt when using the sharp edge when it's not needed.
If you have a fleshing knife with one blunt edge, or one square edge. It is a single edged fleshing knife.
The Necker Knife is a double edge. The curved edge is just like a razor blade and never needs a tuning steel, let alone a grinder.
The other edge is squared off and very sharp on the corners.
All that is needed to sharpen a "Necker" is a few swipes with the back off a pocket knife blade, or one edge of a pair of good scissors, or something with good carbon metal. A tuning steel will trash it fast.