Never thought I'd have to write that sentence. But here we are. We recently had to have our old 1920s home rewired, and in the process discovered some sconce boxes that had been plastered over. Now that we've discovered them, we would like to use them. Problem is, someone back in 1941 (we found the newspaper they stuffed in there) cut the nipples off so that now we cannot screw new nipples in to hang the sconces. What can we do? First pic has plaster in the middle. Second pic is a cleaner but still cut off nipple. How do we get the cut off nipple out of there?