Pelz's "reasoning for this effect is that a significant amount of energy is lost from a putt's speed when the ball hits a fiberglass flagstick. The speed-loss enables gravity to pull the slower moving balldown into the hole more often."
DeChambeau states "It depends on the COR, the coefficient of restitution of the flagstick." When there are wood sticks used like in The US Open he will take it out. "When it's fiberglass, I'll leave it in and bounce that ball against the flagstick if I need to."
Yves C.Ton-That after 1000 made putts(500 in and out) said the findings were clear-cut. 1.If the pin is not leaning forward, leaving it in the hole always helps to hole the ball. 2.Balls that are not holed come to rest significantly nearer the hole if a pin is not removed. Personally, it helps me with my depth perception. 3.If ALL the players leave the flag in it saves 15-20 minutes per round.
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