I am experimenting with writing a tutorial here, so bear with me for a while. I'm using photographs only for this , not clever enough to make a video yet, :-)
Right ....
How to make a double-stitch ... here goes -
This is to make a double-stitch on a ring.
1. Wrap the thread around the fingers and pinch the beginning and the end of the thread together so that it doesn't slide. Keep the thread taut by stretching out the middle finger.
2. With the shuttle thread over the hand, slide the shuttle upwards between the loop made by the shuttle thread and the thread between the pinch and the middle finger. Bring the shuttle over the finger thread and outwards to the right.
3. Pull the shuttle thread slightly to get something like this.
4. Now relax the middle finger while pulling the shuttle thread. If you do it slowly, you can see that the thread is beginning to flip.
5. Pull the shuttle thread taut and the loop is transferred to the thread round the fingers.
6. Slide the the loop slowly towards the pinch, controlling it using the middle finger while maintaining the tautness in the shuttle thread.
The first half of the double-stitch is done. Now, for the second half.
7. Now, let the shuttle thread hang over the front and slide the shuttle from the top, between the finger thread and the loop made by the shuttle thread.
8. Bring the shuttle down and you get a loop like this.
9. Again relax the middle finger and pull the shuttle thread to make the flip.
10. As with the first half, while maintaining the tautness of the shuttle thread, slide the flipped thread to wards the first half.
Voila! You have made a double stitch.
This is how a row of double-stitch looks like.

To test whether you are flipping correctly, pull the shuttle thread slightly. If it slides, or is
alive as someone I know terms it, then you are doing it right.
Click
here for a printable version of this tutorial.
That's it, my little contribution to tatting, LOL. Other tutorials may follow.
Thank you to all that have left comments about this. It certainly is very encouraging and you can look out for more tatting tutorials from me.