Hi all,  im having a bit of an issue with the above watch. The crown (female end) is constantly sliding off the male end as the movement has a little bit of play inside the case which is a on earth piece - access is via the front by removing the glass   The customer who brought it in had dropped it and it came to pieces so I'm not sure if he's lost a piece - like some kind of movement ring to secure the movement.   There are two case screws with lugs on the back which are fine, an