I replaced mine yesterday so i can now use the sat nav Woo Hoo
There should be a plastic ring between the rim of the ciggy lighter and the trim. A new lighter come with a plastic ring that is bigger so the hole needs filing at bit..
Inside the door panel, the orignal ciggy lighter a barrel screwed up to the top then was secure then connected the cables.. Mine now is snuggly fit to the ring and thats all