Uh, I hate to say it but I did watch the guy from UTS-Carolina Telephone replace the ringer coil in the green rotary dial phone in my parent's bedroom when I was seven. I think that would have actually been the second grade. I did have to ask him why it required four wires since only three came in through the line cord. He didn't have an answer, or at least one that he thought I would understand at that age. Of course that was back in the days where phones were rented, the phone company repaired them, and it was free.
