Angle grinder support. By Mr Tool Junction. 6:50 video:
https://www.youtube.com/watch?v=IhCefuWD0no
Previously:
https://www.homemadetools.net/forum/...773#post152215
https://www.homemadetools.net/forum/...005#post157032
https://www.homemadetools.net/forum/...243#post150106
