I was driving home yesterday from MMiller's place and noticed a funny sound. So I stopped and noticed the inside of my left rear tire was covered in brake dust. I am thinking it must be a piece of gravel or something, as I didn't notice it grabbing and the drum is not hot to the touch. Either way I need to tear into it. I doubt I have the right size here. Can you get at it with a regular socket, or do you need one of those special thin wall sockets?