Place both the feathers together and grip between the thumb and index finger. When the grip tension is released these should try and spread outwards. If they try to spread inwards then they are the wrong way round and need reversing.
Now drop the thread back down the other side. (I 've let go of the tension on the thread so that you can see the loop). Make sure that the downward thread goes between the thumb and index finger again. We now need to repeat this procedure again. Make sure that the next up and downward movements of thread go between the thumb and index finger again but the thread this time needs to go in front of the previous loop.