Hi, new here. I have three valves in my bathroom shower, hot cold and diverter for shower head. I recently replaced all three, they are phiser. Following replacement all worked fine the diverter valve became hard to turn and is not very difficult to open and close. It feels like I'm going to snap something there. Tried removing everything short of the valve again and sprayed WD40 into the valve, the valve remains very hard to turn any advice is appreciated, they're brank new and the H & C valves are fine.