A fifth category appeared after the first week: Q.
Question mark.
Otis had always said the most expensive mechanic was the one too proud to admit he did not know yet.
Isaiah kept the Q tractors separate.
The yard began to change shape.
What had looked like fifty random dead machines became an inventory map. Engines were tagged by compression readings. Pumps were capped after removal and labeled with serial ranges. Transmission cases were drained into clear pans so Isaiah could inspect the oil for metal before deciding whether to open them.
Denise watched the system emerge from the kitchen window.
On Saturday afternoon, she came outside carrying a ruled notebook.
“You know what you need?”
Isaiah was underneath a tractor replacing a starter cable. “Money?”
“That too.”
She sat on an overturned bucket. “You need to write down where every part came from.”
He rolled out from under the frame.
“I know where they came from.”
“You know today.”
“I’ll know next month.”
Denise raised one eyebrow.
Isaiah stared at her for a second, then laughed despite himself.
“Granddad used to make that face.”
“Your grandfather learned it from me.”
She opened the notebook. “If you sell one of these things and something breaks, you need to know what you put in it. Otherwise every repair starts from zero.”
That evening they created the first Callaway build sheet at the kitchen table.
There was no company name yet. No logo. No legal business. Just lines for chassis serial, engine source, hydraulic pump source, transmission source, hours estimated, seals replaced, fluids used, and test notes.
Denise drew a box at the bottom and wrote CUSTOMER in block letters.
Isaiah looked at it.
“Little early for that.”
“It’s only early if nobody buys one.”
A buyer appeared nine days later.
Curtis Boyd operated a small mowing and pasture maintenance business east of Harlow. He had heard about Isaiah through a cousin at the diesel shop and arrived driving a three-quarter-ton pickup with a trailer hitched behind it. He was in his forties, compact, sun-darkened, and suspicious of anything described as a bargain.
He walked around the tractor twice without touching it.
“You rebuilt this?”
“Yes, sir.”
“From how many dead ones?”
Isaiah smiled. “Depends how you count.”
Curtis did not smile back. “I count whatever breaks when I’m ten miles from the house.”
“That’s fair.”
“You run it under load?”
“Loader, PTO, and transport around the property.”
“How long?”
Isaiah hesitated.
Curtis noticed.
“Exactly.”
The truth was that Isaiah had run it enough to know the systems functioned, not enough to know whether the machine would survive eight-hour commercial work.
He could have exaggerated.
He did not.
“Not long enough to tell you what it does after a full day,” Isaiah said. “So take it ten days. Bush hog, move dirt, whatever you normally do. Don’t pay me until you bring it back.”
Curtis finally looked at him rather than the tractor.