We can put in some non sticky putty, or balancing clay in that gap and press in screw down the tranny. After that remove the tranny and see how much clay is left. Maybe epoxy in that much so the impact moves to the soft plastic of the tranny?
P.S. I don't have my buggy till saturday (or if fedex decides to be kind sooner)
so I will try it once I get mine in hand should be brand new.