I learned my lesson way back in my TV servicing days when I ended up married to one of those click click rotor boxes that lost their sense of direction 5 minutes after the door closed behind me. It got to be so much of a PITA I could catch a nap as the truck found its own way to the calls.

You need to buy a new silent rotor, I'll even install it free of charge.
Why? This one works just fine!