Pencil lead manufacturing.
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Previously:
https://www.homemadetools.net/forum/...741#post216615
https://www.homemadetools.net/forum/...008#post191263
https://www.homemadetools.net/forum/...033#post224424
https://www.homemadetools.net/forum/...709#post133111
https://www.homemadetools.net/forum/...135#post227207
