I opened up a switch box and found that a light fixture was added next to the switch which is at the top of my basement stairs. The switch is a 3 way. The hot for the added light is connected to the switch, and the neutral is screwed into the back of the switch box. I am not sure who wired this, but judging from the age of the fixture and wires i would say it has been this way for 30+ years. The house was built in the mid 40's and the wiring is in a metal jacket.

My assumption is that this is a safety hazard that i was lucky to catch, and the light should be disconnected.

Unfortunately the switch is original and pulling a new wire would be a nightmare. I would like to keep the light. Is it possible to disconnect the 2nd switch in the basement, and use the old 3 way wire as a neutral?