The wood barrel has a spiral cut into the outside, and the metal sleeve that travels up and down the outside of the barrel, in between the two tabs that stick out of the slot pushes the lead forward or pull it back . . .
NOTE: This article is now included in the print version of The Leadhead's Pencil Blog, available anywhere you buy books, or also from The Legendary Lead Company.
To order, here's the link: Volume 1 at Legendary Lead Company
Outstanding!
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