OK. I see what you are looking for. I have a jig made up to build your own from GT flat nocks. It fits most any drill press. Everything including cutters and holder for the nock. I'd love to sell it for $20 Or, send me a PM with your email address and I'll send you a photo of my setup, so you can build your own.
GT flat nocks are 20 grains. If you run them through the drill press mill I have they will be less than that. I used to make them up but I'm looking to get out of it, since they are commercially available. If you have access to a machine shop I'm sure you can mill the flat nocks to get what you want very easliy.