I believe my current Fairbourne screens are one of the last batch that they supplied. They are 5mm thick (well, 4.9mm actually). These were made because of the number of 4mm screens that were cracking at the stress point where the outer screens meet the bodywork. They were a tight fit into the bodywork slots and were more tricky to fit but do seem more substantial than the original 4mm ones.
Like Planenut, there is nothing wrong with my current screens but it would be good to have spares on the shelf 'just in case'.
