Enormous caster. 0:47 video:
https://www.youtube.com/watch?v=FlsO6v9nY6w
Previously:
https://www.homemadetools.net/forum/...374#post135259
https://www.homemadetools.net/forum/...370#post135239
https://www.homemadetools.net/forum/...087#post120616
https://www.homemadetools.net/forum/...515#post110808
https://www.homemadetools.net/forum/...971#post125088
https://www.homemadetools.net/forum/...038#post120318