I have had reasonable results using the carbide drill bits from Drill Bits Unlimited on this Forum under that name in our Hobby Showroom. I use a normal sewing needle to make a indented pilot hole and work on a block of hard wood as a backing. A good illustration is the conduit that holds the plug wires on Mercedes DIII/ DIIIa Engines; The appropriate brass rod can be filled flat along it's bottom, punctured with the needle, and then drilled for the wires. Your control horns are trickier, you are better off drilling the hole, THEN cutting your control horn around it to make the drilling manageable. (A little small to hold in place and drill if you reverse the sequence!) I drill by hand with a pin vice.
HTH,
Cheers,
Lance