Ok, so I went to Guitar Center to buy a nut, yet they didn't have one that would fit...besides they only sold those cheap plastic ones for $.89. So I have a Graphtech nut on the way from Stewmac, which I'll replace myself and modify as needed. Oh, and good news for now also: I was able to find the piece that broke off and glue it back on for now. It's holding, so I'll be able to jam until the replacement comes. I'll update once I get the new one in.