I've got a light downstairs with the switch upstairs. I want to add a switch downstairs. I have access to the light's wiring and can add the switch easily there. I don't want to rip up the drywall though to put a 3-wire cable in.
Is there any way to use a single pole/2 wire switch in a 3-way setup?
This is a box I currently have access to and could wire the near-by light switch (I've got an unused one very close). I've verified that one cable goes to the light and the other to the switch.