Flat weave rugs on the stretcher in Nepal

Have you ever wondered how the weavers get the rugs into a perfect rectangle after removing them from the loom?  Well, being a lifelong quilter, I wondered if the rug workshops blocked the rugs when damp and then let them dry to a perfect shape.  In fact, my supplier in Nepal uses a stretcher to create the perfect rectangle.  Here are pictures of 2 flat weave rugs on the stretcher in Nepal.