Rotoherb has it right. That last article (where they actually did their own studies) clearly says that there could be a benefit for a guy like Hernan: "If your goal in life is to hit home runs, then I don't think a corked bat is going to help you too much," said Nathan, who has published studies on the subject. "On the other hand, if you're sort of a contact hitter, a singles hitter, then a corked bat probably can help you." A quicker swing means a batter can watch the ball longer before taking a cut. "The longer you watch it, the more information you have as to how you want to swing at it," Nathan said. Adair said the standard way for players to cork a bat is to drill a hole about 6 inches down the length of the bat and add cork, high-bouncing rubber balls or "whatever their fancy is." Sosa's bat contained a half-dollar-size piece of cork about halfway down the barrel. Baseball players are famously superstitious, and if a player succeeds with a corked bat once, he is apt to use it again. Also, the reputation of corked bats has a strong hold on players looking for an advantage. "Let's say you're expected to hit about .250 and about June 4 you're batting .205," Adair said. "Your timing is off, you can't seem to hit and you see your $2 million going out the window. You take an ounce off the bat and maybe it makes a difference."