I'm upgrading an outlet in my living room from 2-prong to 3-prong. The box has a number of holes in it, but none of them appear to be threaded, and none appear to be the right size (I was told that the grounding screw will be an 8-32, and the holes are much bigger than that). The box is definitely a ground - I tested for that.
Any advice on how to proceed?
Are grounding screws really 8-32s? What size are they?