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Wait they didn't show how they insert the graphite into the wood. That's the only reason why I was watching this.

they did... it's inserted into a groove, and the two pencil halves are glued together, at 4:45 https://youtu.be/fow-LsdaH2E?si=bOIb8Q01_4V04uQ2&t=285

I had to play in slowmotion to catch it. A lot going on there.