hand weaving- converting a 4shaft draft to double cloth?

I have a four shaft draft that i want to convert into an eight shaft double cloth so i can weave a piece of fabric that is twice the length of my loom. I have the threading, tie-up and treadling worked out for a single layer of fabric but don’t know how to incorporate the second layer of fabric. can anyone help?

You want to make it double the length or double the width? For a double length you need to measure your warp twice as long is all. For double width, there is a technique to do this on just the 4 shafts, but you can do it on the 8, It involves threading the pattern appropriately through each shaft (1,2,3,4,8,7,6,5, I think) and then raising all but the bottom shaft to make one pass of the shuttle, then all but the upper shaft for the return pass. I believe Deb Chandler’s book on weaving covers it. It’s been a long time since I tried it.

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