http://www.montana-riverboats.com/Pa...ctor_Fly2.html

....with this one you tie the tippet to the eye of the hook and then
throw a surgeon's loop over the front end of the soft foam body, so it
doesn't collapse backwards over hook (the way a San Juan Worm usually does).

I've hooked some pretty good bonefish on this fly, and one permit:
the only one I ever caught.