Rebecca called after reading it. "Most people hate sending me a report that says they don't know," she said. "You're making a habit of it."
"Only when I don't," Noah answered.
"Good. Keep it that way."
The work began changing his schooldays. Noah carried a pocket notebook between classes and wrote questions whenever he thought of them, but Ms. Porter insisted that customer messages wait until lunch or after school. She saw how easily the workshop could consume him and reminded him that mathematics, physics, and technical writing were not distractions from the business. They were part of the education that might allow him to handle more difficult problems later.
She assigned the class a project requiring students to write a clear maintenance report without assuming the reader already knew the equipment. Noah used a fictionalized example based on one of his damaged castings and discovered how difficult it was to explain uncertainty in plain language. A phrase that seemed precise inside his own head often became vague when another student tried to follow it. Ms. Porter marked several sentences and wrote, A customer cannot inspect your thoughts. Give them evidence they can check.
He carried that note back to the workshop. On the wall beside Earl's old calendar, he pinned a new sheet labeled WHAT WE KNOW, WHAT WE THINK, WHAT WE STILL NEED TO TEST. The categories were simple enough that Rachel understood them immediately, and practical enough to improve the phone calls he received. When a customer asked whether a component would fit, Noah could explain the exact status of his evidence rather than hide behind a vague yes or no.
His inventory slowly expanded beyond the original engines. Farmers began bringing in discarded housings, serviceable accessories removed during repairs, and parts from machinery awaiting salvage. Noah refused to accept items with unclear ownership, dangerous contamination, or conditions he could not handle safely. Anything he did accept received an intake record before it was mixed with his existing stock, because he had learned how quickly a part's history could disappear once it left the machine it came from.
There were awkward conversations. A man wanted Noah to sell a fuel-system component without inspection because the farm needed it immediately. Another offered cash if Noah would describe a used assembly as rebuilt even though no rebuilding work had occurred. Noah declined both requests and watched the men leave, taking with them money he badly wanted to earn.
The first time it happened, he complained to Rachel over dinner. "I could have sold that part in five minutes. Now he's probably going to buy the same thing from somebody else who doesn't care."
"Maybe," Rachel said. "And if he buys it from you and something goes wrong, who gets the call?"
"I do."
"Then you're not just deciding whether you want the money. You're deciding whether you want to make a promise you can't support."