I prefer to use files with the safety edge, these have a single row of cutting teeth jutting out. The system works on single bevels, but the filing action stays mostly on the bevel side with the flat file push with a bit of a lean on the non beveled side, then a diamond hone and leather strop to make them shaving sharp. I apply the serration on the beveled side, not the flat side of a single bevel. I use file laying flat to clean up the flat side of the blade and very light strokes with a diamond hone for clean up and then a leather strop.