Third and inches

 The football expression is fourth and inches, so this is not a sport tale. Making a loom required 3 teeth per inch to get 19 across a 7 inch span conforming to the available loops. Imperial scale rules don't help, and rather than get out the metric equivalent I drew a quick sketch in LibreOffice then exported to PNG and PDF.

ODG:

And the works-in-progress at camp:

4-sided loom:

Hammering teeth

Teeth on edge

Two sided loom:

The finish line.

Lining up for pre-drilling in clamp.