I had issues in the past with roof vent cranks stripping out. I'm not exactly sure what you have on your windows, but maybe this can help.
On the roof vent cranks, the gear system was inside a metal case. The case was pressed at the factory, and its operation depended on that case being sealed. I had two that were splitting apart and the crank would strip quite often.
Since it was clear that there were pegs that the cover plate was pressed over, here's my solution. I put the crank mechanism in the vise (I realize you can't easily get the window crank out, so pliers might work) and squeezed it back to the normal position. If left alone, it will strip back out with in a couple uses. I ended up then putting a center punch on those pins and pounding them. That spread the pins apart enough to hold it, and then the entire mechanism didn't have to be replaced.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR