This may sound a little silly but I can't figure out how to change the bulb in the light over my tub/shower. As you can see in the photo it consists of a white cylinder surrounded by a metal ring. I can rotate the plastic cylinder about 90 degrees but it doesn't release it. I tried putting some force on the metal ring but it didn't seem to want to come and I am hesitant to accidentally rip the whole fixture out of the ceiling. I have searched and found instructions for newer flush mount light, where one pulls the whole thing down by the metal ring and it is held by spring clips -- but I am unsure if this one functions likewise. I would guess the fixture is from the mid-1980s based on the style of the bathroom. Please help. Thanks.

I've got two recessed lighting fixtures that are having problems, and I'm not sure what the best way is to fix either one. Fixture #1: The multimeter says there's 120V, but the bulb doesn't illuminate. My best guess is that the tab in the center of the base has become bent and no longer makes contact with the bulb. I've tried sticking a screwdriver in there (after turning the power off, of course) and prying the tab back up but without success. Looking up the inside of the can, the white wire from the socket heads out the side, as does the black wire after a brief detour into the thermal protector, heading no doubt into the electrical box on the outside of the can up in the attic. Is there any way to repair this? Or is it easier just to replace the whole can? Fixture #2: One of a series of 3 lights in a hallway, they will come on for a while and then with a click they will all turn off. Sounds like a thermal protector to me, but in this case the can itself is in a finished ceiling and I have no access to the electrical box. Do I just clip the wires, replace the thermal protector, and then reattach the wires with wire nuts? Thanks so much for any advice, Chris