You do have a noob, it's v2 w/ the M092117 SN. Noisy rotors are par for the course w/ the asian 21j, but you should be able to put the screw back in if you can find where it came from. At that point, if it's running you should be ok. The bezel just isn't catching the stops when you turn clockwise. You could take the bezel off and bend the stops up a little more to fix it, or just don't worry about it, since you probably won't be scuba diving with it.