A tiny typo, really, in the description of "Tinkering IV":
"Just when you thought Tinkering couldn't get much better, along comes Tinkering IV. In addition to doubling your repair speed, now you can make simple tools like Frying Pans, Hatchets, Hoes, Watering Cans, and Knife and Boards."
I think you mean "Knives and Boards."