Making a loom

[richsc]

Deb pointed me to a website that has schematics for a warp weighted loom, but in looking at it, I can't figure quite how it works. The warp threads alternate back/forth, but how do they get switched after the shuttle is passed through them?<br>
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Has anyone built one of these before? The general design seems pretty simple so a reconstruction looks straightforward. <p>Legio XX<br>
Caupona Asellinae</p><i></i>