Hook & Moor automatic boat hook for threading lines through mooring balls and post rings. 37-second video:
https://www.youtube.com/watch?v=7EAwDS9i9p0
https://s3-us-west-1.amazonaws.com/h..._moor_tool.jpg
More: Welcome to Hook & Moor
Previously:
https://www.homemadetools.net/forum/...8241#post87066
https://www.homemadetools.net/forum/...847#post100235