They are the earlier generation (1st gen?) Grizzlystiks which are a tapered carbon shaft. Alaska Bowhunting supply has since changed the manufacturer to Victory and has actually had 2 generations of those. The 1st gen are not considered a micro shaft as far as I know.
This is not a hugely important problem for me to solve. It would be nice if I could shoot those gen 1 shafts on a d97, micro diameter, style string but I don't know if there's a nock that fits a .206 ID shaft that fits on a smaller diameter string. If the string (and bow) were mine, then I'd just re-serve it with thicker serving. That's not an option in this case.
I think I'll just experiment with doing a 2nd ply of serving with dental floss where the nock attaches to the string. Temporary, and probably not durable but probably okay for short term experimentation...that is unless you guys are aware of a nock size the will handle my issue, then I'd just buy some of those. Otherwise, this ain't a major deal. Just thought I'd ask.
You might try some .204-.205 nocks and see how they fit the shaft. There are more nocks to choose from in the .204-.205. These nocks should work just fine and if they are a little lose, you can dab a very small amount of super glue to them with a toothpick to keep them from turning.
Easton X Nock, Bohning A Nock, Black Eagle R Nock, AAE IP5 Nock.
Or use a pin bushing and pin nock like the Gold Tip Kinetic .204 Pin Bushing and pin nock.
As for trying to serve over the string serving, that doesn't work well as the over serving wants to slip down into the grooves of the string serving and separate it. The finished diameter usually will end up being too fat.
Either reserve the string with a bigger center serving or try the .204-.205 nocks.