Gut is the term we use for the material we make the eye with on a Blind Eye Hook. Tennis rackets were also strung with it and physicians still use it today as sutere material. It's also referred to as Cat Gut. It really doesn't have anything to do with Feline Intestines. It simply is a contraction of Caterpillar Innards. See NATIONAL GEOGRAPHIC SILK GUT ARTICLE and GROWING YOUR OWN SILK GUT both in the articles section under Educational Resources above.

Above you see a Jock Scott tied by Gordon Chesney. Gordon is, among other things, a nice man with a keen interest in Salmon Flies and the things that go into them. Even though he's relatively new to the fold Gordon has been a very busy boy. To see some of what he's been up to click on GORDEAUX