Hi, I really have no idea about I have a suggestion, Pardon me if you have allready done so, but have you called CZ-USA back and talked to one of their gunsmiths? I would also check wit the folks over at CZCustom. If between the two of them if they can't give you an answer, I think I will be extremely surprised.
Oh yes, and please allow me to say Welcome to our Forum. We do try to help everyone that comes here, but sometimes when someone asks a question it's in an area that has little traffic, and so gets jumped over, For which I do apologize.
I do hope you get the issue resolved and please let us know how things turned out?
OH Yes one more thing, (Yes I really am that absent minded) do a copy and paste from this to the General Firearms Questions. That way you will have much better result in help. and we here do not have any problem with folks posting the same question on different Boards as long as the question and Board(s) have anything to do with each other.