2 flute is more rigid than 3 flute so easier to find in small sizes.

Drill Service have slot drills in silly sizes and good prices. I have to start somewhere in my quest, might as well be budget tooling. They may be crap, I'll let you know.

http://www.drill-service.co.uk/Produ...060000&Tool=77

Also sampling their small fishtail point slot drills, never tried fishtail, sounds like a way around the centre cutting scrape line.

I did put the mill on top speed once and started winding the spindle up towards 4000 rpm but chickened out at around 3000. It could probably do it, but not in my comfort zone for a long haul, I am not very brave. Besides, the faster you spin them the faster they wear out.