Worked perfectly out of the box, I am really happy with my new rotor (and new carbon stator). PYI I did a great job of getting the parts shipped quickly, including a last minute update to the shipping address after I mis-typed. I have to say as well that PYI provided great over the phone support when my original shaft seal (10+ years old) had begun a slow drip on the way to Jamaica. Love the product and the company.