Are there any web videos showing someone weaving with three rigid heddles? I've read the two books (Xenakis and McKenzie) on the topic of making 4-harness textiles with the rigid heddle, but I'm having trouble picturing how it actually works. It sounds cumbersome to manage all those heddles. I'd like to figure out how it works before I actually spend the money for extra heddles. Any advice will also be appreciated!