To correct bad swing mechanics it takes many repetitions so that positive muscle memory can be created. A fantastic drill to correct this error is called the "Bat Path Drill" which can be accomplished by putting two tees next to each other (one behind the other) or using the ProXTee and using one tee top for the ball and the other as a guide so that when the hands are dropped the bat touches the first tee top. This provides instant feedback to the hitter so that he can recongize when he is dropping his hands.
Evan Longoria demonstrates this drill on a hitting tee called the ProXTee. The video explains it better than I can.
https://www.youtube.com/watch?v=LmwCPCbCyNY
The 2 tee drill promotes the wrong bat path. If you want to drive the ball into the ground, these are the drills to use.
Thank goodness Longoria doesn't use his practice swing in games. He would be out of work.
Two tee drill (watch him drive it into the ground)
MLB bat path (notice the red dot before contact proves the 2 tee drill is bad)
