[trevil]

The plastic cover slides off. You will see the cover is wider at the end pointing toward the center of the roof, so I just used a screwdriver and pushed on it to slide it off.

And ues, add me to the long list of people that has a visor that flops down -- worst time is in heavy traffic, surrounded by idiot drivers, and everybody starts hitting their brakes. At my height, the entire view in front of me is blocked.