Thanks - I had never seen a patent document before! My DH teaches engineering at a local high school and I am always telling him sewing machines are the most amazingly engineered machines ever. If one of my vintage machines ever breaks beyond repair, he wants to let his classes tear it apart and study it. I told him it would be a long wait for that to happen! They just keep going and going... Now my computerized machines - not such a long wait, but he doesn't want them!