Barber pencil -- 3

I need something similar to a nose trimmer build, where the blades rotate in a circle motion what im thinking, if you feel you can build a hair trimmer this project is for you. The most difficult part i feel is the rotating blade, making sure it doesn't cut skin. I had a few designs done in the past but i feel i need to have them up to date, i know the dimensions pretty much just need it physically built.