I had a leak in the wall from my showerhead. I went to unscrew the showerhead and it cracked off in my hand. The crack is down at the thread (where it would attach to the pipe in the wall). 3/4 of the thread are still in the socket and there is nothing to grab onto to pull it out. It also looks a little rusted in there. Is this what I would use a pipe extractor for? And if so how do they work?