Well, maybe they did use the winch. After all, it was certainly left behind when the crew of the Anisedoria explored the derelict 15 years after the Nostromo had long been gone:
The disassembly of the winch to carry Kane back to the Nostromo is a fine example of 'Alternate Canon' where such evidence otherwise can only result in conflict of 'fact'. I guess, you can say the same thing about who turned off the beacon as well.
Make your own mind up about this one, I say.
-Windebieste.