Vise-grip clamp. By WILD ROOSTER. 14:47 video:
https://www.youtube.com/watch?v=4DiRSwGtH4I
Previously:
https://www.homemadetools.net/forum/...264#post116146
https://www.homemadetools.net/forum/...972#post140771
https://www.homemadetools.net/forum/...021#post140843
