I like the jig the author makes to sand out the middle of the two boards for the ruler to fit.
https://www.homemadetools.net/forum/how-make-ruler-marking-diy-84256
I like the jig the author makes to sand out the middle of the two boards for the ruler to fit.
https://www.homemadetools.net/forum/how-make-ruler-marking-diy-84256