Hi, you managed to get a whole litre of oil into your gearbox! I have the same gearbox - with no issues. I've never managed to get to the refill plug to top up, and never applied a concerted effort so I've never checked it. It's in a monocoque chassis too. Your topic has encouraged me to look at this more seriously. So, did you use the filler plug, if so how did you get to it? If not, what cunning method did you use?