Tiger Woods called it “that whippy a** shaft” to Lee Trevino, but there’s a good reason the AutoFlex driver shaft has a place in Lee Trevino’s bag. The recognizable, but also mysterious, black and ...

For years, the industry narrative has been simple: if you swing fast, you need a heavy, boardy, extra-stiff shaft. Then came AutoFlex. Developed by Dumina Co. in Korea, this "hidden" technology ...

Not much is known about the AutoFlex shaft made by the South Korean company Dumina other than there is a hefty cost to be paid for big gains in distance. Count Morning Read contributor Gary Van Sickle ...