Our Delta shower head started dripping after being shut off and would not stop. Its a 13/14 series and takes the RP46074 cartridge which is just coming up on five years since the home was built. I purchased another Delta RP46074 cartridge and replaced the old one. After turning off the valve, the drip continues without stopping, though not as much as before. I noticed if I add 2 lbs pressure on the valve handle, the dripping stops. I currently have a 2 lb weight suspended on the handle to prevent wasting water. Any ideas what I may have done wrong or suggestions what I might do next? The installation seemed pretty straight forward and all clicked into place like the Delta instruction video showed. I also lubed up the three O rings on the replacement valve before installing with the recommended O ring lubricant.