I knew a friend, because these types of pieces are not disassembled because they are damaged, most of them or bring screws and uncovering them from anything serves your failure is something else. Take it to a workshop to review it, you will know what to do and if you want them to serve you well, do not try to give indications that doing because nobody likes that customers tell you what to do, at least like this is here in my country and most of them here comment badly of the customers who do that and even reach the point of not attending them. Good luck and if you can comment as it went and that they told you it was the fault.