For those who on occasion feel a little pain when tying any fly with a stinger hook. By utilizing a small magnet you can keep the stinger hook out of your way. The magnets can be purchased at most home improvement or craft stores. The size of the magnet is up to you. I personally like the 3/8 of an inch circular rare earth magnets, as they have a very strong magnetic field.

The picture below illustrates how I used to tie intruder type flies. But after 10-20 times catching the stinger hook, something needed to change. 

By utilizing a small magnet, you are able to keep the stinger out of the way. Please note, I have found trapping the stinger hook between the vise and magnet works great.