Dumina Journal

Shaft knowledge. No fluff.

Fitting guides, swing speed education, technology deep-dives, and honest advice from the engineers and fitters behind AutoFlex and AutoPower.

Ava Chen and Lucy Cui AutoFlex Drive Chip and Putt 2026 Augusta National champions
Tour Report
April 2026 · 5 min read

Two AutoFlex Junior Champions at Augusta — 2026 Drive, Chip and Putt

Ava Chen (Brooklyn, NY) and Lucy Cui (Honolulu, HI) won their divisions at Augusta National's 2026 Drive, Chip and Putt National Finals — both playing AutoFlex shafts.

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Best driver shaft for seniors and slow swing speeds
Fitting Guide
April 2026 · 7 min read

Best Driver Shaft for Seniors and Slow Swing Speeds in 2026

Why lighter and more flexible isn't a compromise — it's the science. A complete guide for golfers under 95 mph looking to pick up real distance.

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What is CPM shaft fitting AutoFlex
Technology
April 2026 · 6 min read

What is CPM? How AutoFlex Uses Cycles Per Minute to Fit Every Swing

Most shafts use flex labels. AutoFlex uses frequency. Here's why CPM is the most accurate way to match a shaft to your swing.

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AutoFlex vs conventional shaft launch monitor comparison
Comparison
April 2026 · 7 min read

AutoFlex vs. Conventional Shaft — What the Numbers Actually Show

Launch monitor data from real fittings. What changes in ball speed, spin, and dispersion when you switch to KHT.

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Why lighter golf shafts generate more distance physics explained
Technology
April 2026 · 6 min read

Why Lighter Shafts Generate More Distance — The Physics Explained

Counterintuitive but proven. The relationship between shaft weight, swing speed, and energy transfer at impact.

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AutoFlex SF305X SF405 SF505 comparison guide
Fitting Guide
April 2026 · 8 min read

AutoFlex SF305X vs SF405 vs SF505 — Which One Is Right for You?

A side-by-side breakdown of every SF Series model. Swing speed ranges, feel profiles, and who each shaft is built for.

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Inside KHT carbon layup process AutoFlex shaft manufacturing
Technology
April 2026 · 7 min read

Inside KHT: The Carbon Layup Process That Makes AutoFlex Different

A rare look inside Dumina's South Korean facility — how proprietary high-modulus prepreg is rolled, cured, and frequency-matched to ±2 CPM.

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