Re: door hinge and pins
This is not an uncommon problem. Whenever you have two surfaces rubbing together, you'll have wear. It's not so much the pin as the contact points of the "fingers" of the hinge plates.
First, make sure the screws in the hinges are all tight so that the hinges are properly aligned. Next you can either clean the hinges with the door in place or you can pull the pin to clean the hinges more thoroughly. Now with the door in place and the pin pushed up about a 1/2", put a few drops of 3-in-1 oil or another light weight oil around the pin, and one drop on each of the "finger" contact points. Work the door back and forth a few times to work the oil in, then wipe off the excess and tap the pins down tight.
Be forewarned, lubricating the hinges can make the door swing by itself if it's not hung plumbly. It is possible that the pins were bent slightly to counteract this problem before, which would also exacerbate the black residue problem you have.
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