I'm trying to figure this out so an image of Jeff's 36 hole head fin was enlarged, cropped & overlaid with grid:
The diameter of each trit hole appears to be 5.5 grid squares. Don't know what size drill Jeff used but most likely 1.6mm. If so each grid square is 0.29mm.
Separation (or wall thickness) between holes looks like 0.5 grid square or 0.15mm (0.006"). FWIW 20# copier paper is 0.10mm. Pretty tiny. Cannot see any way to fit 36 into the V10R head unless this tiny spacing is maintained.