Sentence:  To add a new <WSD>weaver</WSD>, simply soak a new one, slide one end under a rib (over the old weaver) and continue weaving with both of them until the old one runs out. ... If your weaver has dried, rewet it and weave several rows as in Diagram 26. 
Meaning of the word marked with <WSD> tags:  A strand of material used in weaving.