>>> Need a couple of good drills for the hitter that rolls his
Top hand over right after contact is made <<<
I have no problem with the wrist (or top-hand) rolling over after contact. It is the premature (approaching contact) rolling that is a serious flaw. I would suggest making sure he has a problem before making changes.
The two main causes for the wrist to prematurely roll are; (1) Lack of shoulder rotation & (2) The lead-elbow dropping below the swing plane before contact. Below are a couple articles regarding the Wrist Roll.
Premature Wrist Roll
Note: I am not in favor of the Fence Drill as Slugger suggest. I find it causes more problems than it solves. Below is an article I wrote regarding this drill. You can read it and decide for yourself whether or not to use it.
The Fence Drill & Bat Inertia