Gear coupled twin screw vise by Andrew Klein. 20:40 video.
https://www.youtube.com/watch?v=iB1DaLbNRac
Previously:
https://www.homemadetools.net/forum/...166#post165267
https://www.homemadetools.net/forum/...327#post169443
https://www.homemadetools.net/forum/...184#post165336
https://www.homemadetools.net/forum/...116#post165022
https://www.homemadetools.net/forum/...792#post167436
https://www.homemadetools.net/forum/...642#post167017
