@blackbird57 When I visit Samarkand later this year, I'll take some bartering lessons from the locals and then purchase a few rugs. As mentioned in comments to your question, my own method is far to eccentric to be useful on a broad scale.
@GayotFow I never use a jig for TH knots, but working around a tube makes the bigger ones easier. Learn to enlarge TH from the basic models and you can make a lot of them without jigs. This form page is about that: igkt.net/sm/index.php?topic=4608.0