Electric winch. By Interesting Engineering. 8:31 video:
https://www.youtube.com/watch?v=28_G9LpHD3M
Previously:
https://www.homemadetools.net/forum/...138#post176439
https://www.homemadetools.net/forum/...100#post164970
https://www.homemadetools.net/forum/...426#post166223
https://www.homemadetools.net/forum/...605#post166901
