What is the best type of grip for hitters?
 

I know that Mr. Kelly recommended "strong single action" for hitters and swingers but I have read in other posts that some use a traditionally strong left hand grip for hitting. What do most hitters use?

And another question that logically follows the previous question. Do you take the club away so that the face of the club remains square to the target (feels closed) or do you allow some roll or fanning of the right arm?

Yes . . . all of those are OPTIONS. You just gotta figure out what works and the implications/construction of the other components.

Bucket is bang on with that insight. Good advice for all who fool around with their components.

In regard to your comment about the "clubface staying square to the target", Im wondering if that is what you really meant? Clubface "looking at the ball" would be angled hinging but "square to the target" , given a clubhead orbit that is Back , IN and Up would imply that the clubface IS closing! Not a good thing for full power shots.

Research "Tracing" a right arm and pressure point #3 deal and "Hinge Action", clubface control, a left hand deal. In start up the clubhead will go back, up and in while the left hand (and clubface) will stay perpendicular to one of the three Basic Planes. Hitters normally use an Angled Plane with a resulting Angled Hinge Action, a "no roll" feel in the left hand.....................and often accompanied it with a 10-2-D grip type, where the left hand is already somewhat turned to plane.