I've only had one cup of coffee, so the brain is only about half power. It's pretty obvious that locating suitable fine thread stock, dies or taps can be difficult.
How about experimenting with changing the taper on the standard NV's. A long thin taper on a standard NV might give a similar effect to a fine thread NV. Tip may need to be cut off to avoid running the needle too far into the seat, but a little testing could identify a sweet spot along the taper. Sorry for the hi-jack.
Before you toast my coattails too much, just remember the coffee comment.
Last edited by Andrew; 05-25-2014 at 07:31 AM.