Replacing door hinge pins and bushings
The upper hinge is super easy and all you do is knock the pin out, replace the bushings and then smack the new pin in.
If you do the lower hinge properly with bushings it will last. It's a lot of work filing the hinge to accept the thickness of the bushing. (The shoulder as seen in the first pic) I filed a little off each hinge half so I didn't weaken it. I remember using a letter size drill bit (closest to .440") to drill the hole for the new bushing