Some typos were uncorrectable — out of the team's reach, or, as Deck tells NPR's Tony Cox, requiring tools and materials that weren't included in his "typo correction kit."
Deck carried a variety of Sharpies, of which "the black Sharpie was the most important." Deck also carried Wite-Out, dry erase markers, chalk, crayons and pens.
Sometimes Deck and Herson couldn't get permission from the typo-maker to make an adjustment to the signage. "They would turn us down, or they'd be apathetic about it," says Deck.
"Or they'd say 'Oh, we'll fix that one later,' and we'd really have to take their word on that."
At the link, you can find an excerpt from their book.
http://www.npr.org/templates/story/story.php?storyId=129086941&sc=fb&cc=fp via The Agitator | Amazon Link | Photo: Benjamin D. Herson