There are a lot of people on here who can help, but you probably should give a little more info.

In short, yes, the WB rest is too popular not to be able to be tuned. I don' t think I' ve ever seen a rest (except a peel-and-stick flipper) that didn' t have centershot adjustment.

WHY do you think your centershot is not set properly? What have you done to evaluate your setting? What happens when you move it?