Well, I know the NRS is older than Alan Batty after hearing him tell how they made billiard balls out of elephant ivory, a couple of years process and using a NRS to take down the balls a hair at a time, and then let them rest. As for what works best for the included angles, that seems to be about personal taste, kind of like gouge grinds. How fine the burr is, seems to be highly variable. I have used a convex grind skew to adjust the shoulder of threaded boxes to get the grain to line up perfectly, but haven't compared another NRS included angle to compare.... For burnishing a burr, the Lee Valley tool would work on a NRS with a 70 degree bevel, but not on one with 30 or so on each side because it is at the wrong angle.... I may have to contact Tom...

robo hippy