Surface grinder - video

Surface grinder. By Family DIY. 13:06 video:

https://www.youtube.com/watch?v=LT1Acft54aA

Great build. Simple. Elegant.

Did you glue in the magnets into the slide?
I don't understand the use of precision calipers as scribers, doesn’t anyone own an adjustable machinist square and a scriber?

aaaaaaaaaaaaa