What about the eraser? What about the machine that mills the pumice that goes in the eraser? What about the yellow paint? Are you gonna go with cadmium pigment or something that won’t kill children, and if so, what? How to you plan to refine the bauxite ore to make the aluminum ferrule that attaches the eraser to the pencil? Were you aware that they are aluminum, or called ferrules? What about the machine that makes the pierced holes through the ferrule that retains the eraser?

I know a shitload of trivia about both manufacturing and pencils. But I could not possibly recreate all the processes needed to manufacture a pencil.

I learned a lot about pencils from this article. It is also applicable to jet engines.

http://www.rstengineering.com/rst/articles/tsodpencil.pdf