Hi, just thought I would comment on my top box which I could not open when I got back from the tail end rally yesterday. The key would simply not operate the latch, so I had no alternative other than to drill a very small hole in the lid (above the double walled area) and after some fiddling I managed to push the catch back and the lid popped open. The next task was to take the mechanism cover off and I fortunately retrieved the plastic cam, which was too big to have fallen through the hole at the bottom, unlike the nut which had.
The nut is 7mm (not very common) so a replacement was found & fitted after I figured out the correct way to fit the cam in place. I used some loktite on the thread and tightened it as tight as possible, so it's hopefully as good as new.
The reason for relating this tale, is that my latch mechanism was becoming increasingly fiddly to open the lid, which I now realise, was the nut gradually backing off and making the operating cam less efficient in pushing the latch. If any of you experience an opening problem with the lid, I suggest you check on the tightness of the nut(loktite?) behind the moulding but be prepared for the inevitability of the spring jumping off the latch mechanism (not too bad to refit) a tiny blob of blutak through the hole sorted that problem. cheers