K, this project started out as a shower that would not work.  It barely had water running through it.  I started  with cleaning out any hard water deposits, no success.  Changed the valve cartridge with a new one, still did not work.  Decided I need to go to the valve itself and replace clogged pipe, this at least got me some water.  I put in the new valve cartridge, again no pressure or water.  At this point I was about to just add another small bedroom.  I inserted the old valve cartridge and taa daa  water and pressure, but now I had a major drip.  You know the kind of drip I am talking about, that drip that annoys you when you are watching TV, studying, and yeah, even when you are on the other side of the house trying to sleep.  Tried to clean cartridges, replaced washers and gaskets, etc and still the stupid drip.  Frustration set in and then I had just had enough.  This trip to the hardware store took me to the plumbing isle to obtain a shut off valve, yep I did it, inserted that shutoff valve on my shower fitting and viola no more drip.  Did earn the "Look" from my wife, but we are not wasting water anymore and now all I have to do is repair the holes created while getting into the plumbing the first time.