Yep, that's how it works, there is a space on one side of the metal backing plate that allows light to escape to the edge of the lens ... works pretty good. Put an LED bulb in there and it's plenty easy to see at night.
So glad I had the other clip .. don't know where you'd find something like that. If you can't, with enough fiddling you'd probably be able to come up with something that extended beneath the cover and slid into a hole or clip that provided some kind of holding power.
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