I own a Skagen Hagen SKW6217 watch. The battery just died in it. I can't seem to figure out how to replace it. Read online about it's top load design and unit body form. All I see is a screw at the back of the watch. All the jewellers I have taken it to are unable to replace the battery cos they can't seem to open it. Is there anyone who can help guide me on how to open it?