Ha ok, you have to disassemble the robbery cover is divided by the top I have lower, but you can ask a workshop where they make copies that take you the part that is inside, because to open the cylinder it is a bit complicated since it has some springs and insurance that if you disarm forget about putting them again if you do not know, but if you are careful to disassemble it, as I told you now you can Rivets that you will have to take with a sincel and a hammer, or when soldiers come to the axis, you must disassemble 2 insurance that they have below and an Allen screw that is in the superior part.