Chalk magnified.
https://diqn32j8nouaz.cloudfront.net...d_fullsize.jpg
Previously:
https://www.homemadetools.net/forum/...832#post206565
https://www.homemadetools.net/forum/...278#post192213
https://www.homemadetools.net/forum/...747#post186501
https://www.homemadetools.net/forum/...298#post161591
https://www.homemadetools.net/forum/...516#post158794
