Question edited for a lot more clarity.
Question moved form Cars and Trucks category.
The part number you stated is the logic board on a Liftmaster Garage Door Opener. No, the cable is supposed to spiral wound around that pulley. It is connected to the spring which takes the weight of the door.
You need the model number to find the manual.
https://www.google.com/search?q=part+%23+41a5021-d
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