Disocnnect the headlamp electrical lead (push back the grey securing clip and pull off) and push it out of the way for more access. Remove the cover securing clip completely, then fit the cover, then reattach the clip, bottom first then top
Sounds easy! I did try and try but it just wouldn't fit no matter what. I really can't be bothered with it anymore.
The pic of the inside of my leveller, does it look right? Is it supposed to be rusty...