My shower head broke so we bought a new one to replace it. The problem is that the pipe in the wall that connects to the shower head looks like it is stripped. It seems like there are fragments of the old shower head stuck in the groves (sorry I really don't know the technical terms) I went to home depot and the plumbing associate told me to take a flat head screw driver and try getting it out like that. It didn't work and I don't want to put too much pressure on it for fear of breaking the pipe. Help what can I do?