Here's the way I'm doing it: First I hollow grind the edge I'm going to serrate. Then, I use a Dremel tool with one of the coned-shaped grinding bits to put in the "notch," or serration, or whatever its called.
Factors that affect the serrations: 1. Size and shape of the grinding bit, 2. Angle of approach of the grinding bit, 3. Depth of the plunge, 4. Patience factor. The last of these is the hardest for me to master!
In fact, I just came in from working on a fighter (ATS-34), and got impatient about the serrations, so they came out a bit uneven. Fortunately, I had the sense to stop when I noticed what I was doing. Hopefully, I can correct it.
After putting in the basic serrations, I use a Dremel polishing bit of roughly the same size to clean it up. Works very nicely, and easily.
The only catch: the patience to be precise.
Marty
------------------