http://montana-riverboats.com/pages/...octor_Fly.html

http://montana-riverboats.com/pages/..._Streamer.html

The Doctor Fly has a rear-mounted hook, so you have to throw a surgeons
loop over the front end of the foam body to keep it from collapsing
backwards. The end result is a fly that swims like a worm. Same thing
for the Roadkill Streamer.