Thanks for your reply. Unfortunately now I have a "real" problem. I went to the hardware store and purchased the replacement cartridge and set about removing the old one. First, the plastic tool that they provided was nowhere near up to the task of removing (or in fact even moving) the old cartridge. So I went back to the hardware store and purchased a Moen Cartridge Removal tool. This worked "better" but in the end it broke off both of the brass tabs of the old cartridge and popped out only the core of the cartridge. So what I have now is the brass encasement of the old cartridge still very much in place. Anyone have advice on how to remove this? I am considering going and purchasing an internal pipe wrench and attempting to remove it with that. Any assistance would be appreciated.