When you have sewn on extensions to all the small braids together your own part, you should be left having a distance in the trunk that is still open. To fill this in, you are going to have to prepare a unique piece of your weave. Measure the distance which you need to fill, and also cut a piece of your weave that is twice that length. Begin with your regular double knot in the end, then roll the weave in to create a small circle. Make an extra knot by looping around the two layered segments of weft, and pulling it tight. Continue rolling up and knotting the expansion until you’ve completed the whole piece.