Excellent write-up, once I worked out how to get the pin out - just knocked it through by tapping it with a hammer and nail.
Removing the spring proved problematic but got there in the end.
I sprayed mine with white grease too and that helped a bit to make it work smoothly.
I didn't realise the number plate bulb holders where twist in so damaged one side, but putting it back seemed ok.
I also removed the rear wiper motor screws enough to help.
Oh, and my big tip, I used a tent peg and chopped it down, it was a fraction thinner so just bashed the ends once in place to stop it popping out (also made it 10mm longer than the original one.
Thank you very much - one happy tailgate owner