I'm not going to lie, I don't really need to know how to cut and make a quill pen from a goose feather. No one does anymore. But! I was completely fascinated by the process of it. It's funny how he uses both vintage tools (an 1800's era quill cutting knife) with modern technology (a NYC metro card!).
The video is from Type@Cooper showing Ewan Clayton explaining the specific cuts you need to make to turn a feather into a quill.