Extending the Pre-wound Warp
When you weave with a pre-wound warp, especially the first time, you will come to the end and see the warp threads taped to the cardboard tube and unable to weave any further.
To get the most out of the warp with minimal waste you can extend it. This is done by releasing the ends from the tape, removing the cardboard tube and attaching the back tie rod and cords to the holes in the warp beam. Attach the cords to the warp beam and back tie rod with a larks head knot. Then tye the ends in approx. 3 cm bouts to the back tie rod. Make sure the cords are winding to the inside of the loom. Check the tension is even and adjust the knots until it is.
A warp extension tube
This same method can be used by making a warp extension tube (See p 64, Saori Self-Innovation Through Free Weaving book). This is a convenient way to extend the warp and it can be used for winding on your own warp. I have shown the warp tied to the back tie rod but you can also use another clipping rod.