On this same subject, I just acquired a 1985 231, my 2nd Mooney and 4th airplane, and when I tried to move the left side visor it was stuck. Wondering if perhaps they weren't designed to pivot, I tried the right side, and it did, but some white-to-beige colored powder (like corroded metal?!) fell from the pivot. So, I applied a little more (ok, maybe a lot more) force to the left one, trying to free it up, and SNAP. And lots more white-to-beige powder!
What am I looking at to repair this, and do I need to fear something far more involved than just a new pivot...like...<gulp> I can't say it...
Thanks for any (informed) replies!