That's exactly what happened to my 95 SR, it came from MN to NE and finally went all the way when we moved to TX. Anyways I replaced my lower hinge (all of it) because I found one down here in San Antonio. Much easier then replacing just the pin. I sat the door on an office chair (top hinge still holding the door) while I took off the bad one and had my wife either hold the door or start the bolts with the new hinge in. Worked like a charm. It's a blue hinge on a white truck but no one knows but me.

You can call me Fez
'95 SR 15x8 steel rims w/ 33x12.5 Duratracs, cranked torsion bars, "Baja" lights
'09 Nissan Sentra SR