So the brake lights on my '81 weren't working. Turns out that the brake light switch (connected when you press the brake pedal) wasn't springing back enough. When I pulled the center plastic plunger part up they turned on. Here's a picture.



I used a bunch of silicone lube but it still has trouble springing out. My question is can I unscrew the plastic part from the metal housing/base to lube the spring properly and clean it? I tried turning the plastic section from near the base but it just seemed to turn forever and not unscrew as expected.

I could just get a new one from autoricambi but don't feel like waiting. Don't think this would be a common part.