NAPLES, Fla. – Not long after Sean Foley started working with Lindy Duncan, he asked her to compose a personal mantra. Duncan, he said, wrote an elegant, vulnerable six-page essay that showed incredible depth.

“Girl, I need it to fit in a yardage book,” he told her.

Duncan, a Duke graduate, has always enjoyed the writing process. Earlier this year as part of a purge, she threw out stacks of journals she’d kept over the years. Perhaps the most famous self-help tinkerer on tour, Duncan has been known for her homemade gadgets, which she named and carried around in a rifle case. Her mom, Debbie, ultimately told her she needed to ditch the rifle case when they’d practice at a Secret Service-guarded Trump International.

The analytical 34-year-old began working Foley, whom she’d gotten to know

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