We inherited an antique chandelier from our "Czech Grandma". It hung in her living room for approximately 60 years. There were several problems with it: most importantly, the aged wires inside the chandelier were shot. One of the light-bulb holders had come loose, and the stem was too long for our living room.
So, I did a complete overhaul - shortened the stem, replaced all the wires, reattached the holder that had come loose, and also put in a grounding terminal.