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This is a 1936 home in Virginia with BX wiring and metal switch and outlet boxes. We went to replace original three-way light switches located at the top and the bottom of the stairs controlling a hall light and found that the neutral wire from switch at the bottom of the stairs is connected to the metal box at the top of the stairs. There is no other neutral in the box at the top of the stairs to connect it to otherwise. With the new switch, connecting it to the metal box is only way to make it work. Is that o.k.? It seems to have worked for 80 years.