I just replaced the Mixit valve in one of my showers. The problem I have now is the new valve is hard to adjust the temperature (impossible once the water is running) and turning it off it very difficult as well. I tried adjust the sleeve nut that holds it in place by loosening it which doesn't seem to help. I'm at a loss for how to fix it so it works properly. As a note, to adjust the temperature, I have to turn off the shower and then carefully adjust it and hope I get the right temperature when I turn it back on. I have also broken off the tip on the square nut once trying to adjust the temperature, I bought a second set as I could not find that specialty nut anywhere.