I didn’t mention drill blocks because I don’t see the need but then I use to drill holes for a living. You should still file 2 flats and debur if you want the nylon to stay in the nut so I just drill on the flat. There are many ways to do the same thing.
FAA certified jet engine and aircraft technician,
Nicholson Speedway class champion 2001,
Yamaha KT100 Service Center,
41 years karting experience