My wife and I got a free secondhand Baby Jogger travel stroller when our baby was born. A year later, it stopped folding. One side wouldn't release and made it very difficult to put in our car. Obviously no good for travel too which we do often enough to matter. We did end up buying another secondhand stroller (but we got one with a second seat attachment and bassinet option so it'll work with planned baby 2 + toddler) but I didn't want to toss the Baby Jogger. Problem is, they're entirely unserviceable with peened rivets holding the frame together. I decided to risk it and grind them all off to see if I could fix it. I did manage to find the broken plastic arm that caused the issue, came up with a clever fix that fit in the tight space, and put it back together with nice stainless steel bolts I salvaged from some aftermarket car parts that came with an old car I had. I bought one $1.29 bolt of an odd size from my locally owned hardware store, and I saved this stroller from the dump. The part that broke is clearly a weak link and I wonder how many of these strollers have been dumped over this little part breaking.
Tl,dr: Fixed an unserviceable stroller with (mostly) reclaimed hardware.