I don't think there is any damage and this particular grinding sound only happens when the cable is pulled tight and is lifting, not on the way down. I think most of this noise is due to the cable not staying nicely on the reel. You probably observed the same issue when the cable gets too slack and unwinds a loop or three. It is necessary to disassemble the middle to be able to carry things through the doorway so I expect the cable to need some adjusting again. Once set in place I'll see about attempting to rewind the cable.
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