The house is old and the plaster is very hard, like a rock. I use masonary bits just to hang pictures from the walls. I believe the plumbing in this wall is original and fragile. It feeds below into an almost inaccessible crawl space. I have discovered over 18 years of ownership that small projects always lead to delays and some creative improvisation to complete. I just built a new lake house in Maine (original 1928 cabin destroyed by Hurricane Irene 2 years ago) and it is refreshing when everything is new and standard size. It's like playing with Legos.