One very nice video demo with the Serafil thread will you find here MollanMedia_Video
The video is a flash video with Staffan LindstrÝm one off the most inovative fly tyers in Norway.
To start the video click - Staffans Renaflue (the words spoken is in norwegian)
On the page where the finger is.
There are also another nice videos on the page (Staffan Monterer Del1 is a very nice way to set up your fly fishing gear)