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I keep having trouble every time we try to install shelving or other hardware in the walls of our brownstone. We’ll drill through a top layer of plaster/lath and then (either a half inch or one-inch in) hit a very hard surface that feels like metal. (These are interior, not party walls.) I’ll poke around one wall and find that I generally can’t drill anywhere in a given area. This has happened in a number of places in our house…. I don’t want to force drilling our of fear that I’ll run into electrical cable, but there’s so much of this stuff it can’t possible be all electrical. Stud finders don’t seem to help. there seems to be metal in random places back there. Any ideas?