Homemade squareness comparator - video

Homemade squareness comparator by R. Steven Lang, Shark River Machine. 29:49 video:

https://www.youtube.com/watch?v=vMSqrOrWYtM


Previously:

https://www.homemadetools.net/forum/...664#post132916
https://www.homemadetools.net/forum/...164#post121054