Just installed one of these. These are now designed so you don't remove the screws that hold the 2 halves together, but you have to twist the halves apart and then twist again to install. The screws are difficult to turn when assembling. The old design was much simpler. Take 2 screws out, put 2 screws back in. Looks like a designer had too much time on their hands. Still a good knob set but more complicated than it nneds to be.