I promised a friend of mine ( Bruce ) that I will make a tutorial with the way the head of a Czech nymph is tied. He(but not only he)has difficulties with the excess of material(the back of the nymph) that remains after making the head.
1. Fix more material (back foil) in the eye of the hook area (precut it in V shape).
2. After fixing the material make a few turns between the backfoil and the eye of the hook.
3. Cut the excess of material
4. Make as many turns of thread as necessary to obtain a nice head of the fly.
A nice finished head and one with exces of material.
I hope this is useful
cheers
Lucian