The replacement part was delivered very quickly, which really impressed me. I saw the claim about the fast delivery but, to be honest, didn't really expect it. I've now made this site a favorite for the future. Anyway, after removing the filter and the six screws to remove the fan motor assembly, the old piece just broke off completely when I tried to remove it. Pushed the new piece onto the motor (this took a little bit of effort as it is a tight fit), replaced the motor assembly (with the six screws) and job done. Whole thing took less than 10 minutes.