Quite some years back, working in a $$$ house...drilled down from the attic/crawl; drilled up from the basement. Found the snake, pulled in 2-12/3 RX. Terminated in panel, terminated load side in devices. Two days later, get a call from the owner, he wants to pay bill. Go to his house, wife comes in & trys to close the "pocket" door.
OOPS, I caught the damn thing dead center, top & bottom, and fished the RX right thru it. There was no visable damahe to the door, the track was OK, but I had to pull the RX out & start over again..
John