To me, it looks like the round "pin holes" are actually rivets to hold the two halves together. Did you check for continuity between terminal screws and those holes?
(Edited: )
As for the "Barn Receptacle" part, perhaps it's called that becasue its surface mount, i.e. it wouldn't be used in a finished area?
[This message has been edited by sparked (edited 12-26-2004).]
