There are a few different ways to tie in a Spey Fly Wing. As well there are a number of different materials that can be used. The look of a Spey wing when compared to the look of a Dee wing is a key factor in this construction. Besides the total somber color scheme of Spey flies, the shell back application is key.
You want to make sure that the head of the fly is as small as possible. If you wrap forward and then back with as few turns overlapping as possible you will be able to tie off at the bottom back of the head. Four coats of clear head cement and you are ready to cast in the old Scottish Tradition.
Now use your imagination. Here is the same construction using different materials. The pattern was tied in the style of Syd Glasso but has all the same elements of how old flies were tied.
Spey Flies - How to Tie Them by Bob Veverka
Spey Flies & Dee Flies by John Shewey