There are very few examples of how to animate a winch mechanism so I thought I would share my solution. The blend file contains a brief explanation of how it works. Uses shape key, key frames and drivers. No rigging.
Short preview here: https://www.youtube.com/watch?v=sJOiZTtbmL0
wow a dream come true, I have thought about this one a thousand times and couldn't figure out how to lay it down hopefully I will learn something from the blend, beautiful and interesting creation, Clive thanks for sharing.