Not sure how you take head apart,there is a thread and shows it apart as i have a slight movement inside 1 of mine............but not tried to take apart.
I would contact DX,make sure you send a pic to back it up as they will ask,and they should sort it issue free.
Then look into it after just in case they do ask for it returned(would have thought unlikely but you never know).
Then you may end up with 2 skyrays.........