Finally! It's like one of those sliding puzzles where one tile is missing. The key is to slide that bottom piece over far enough to the right to allow this corner piece to come out.
Then slide the left down enough to remove the corner brace in the upper-left.
Then, slide the entire top strip off to the left.
Then, slide the left trim up and off.
Repeat on the other side.
Here's the halo tube revealed.
Now we can also see the CRT face is pristine.
Wish I could say the same about the plastic safety cover. Time to start polishing.
