I had to replace my water heater a few days ago. After installation, my shower would barely trickle out. I am on a well with no filtering system. I replaced the old shower head and after installing the new one I still didn't have very good water pressure. I suspect the plumber may have messed up my Delta 1 piece handle by overturning it when he was testing after turning the water back on. What should I look for when removing the Delta handle? I'm thinking that it has gotten out of line or something. Please advise.