Around here there was a period of time, around the 60's where they EC's would take the grounding wire and run it outside the box, wrap them all together and install them under a bolt and nut through the bottom hole in the metal box. That might be all well and good, but when you went to loosed the nut on the inside of the box, you could not re-tighten it. You were left with a loose grounding connection and no way to fix it without removing the box.
