I used mechanical MK units and only used the one retract servo to operate all three. After much adjustment I finally got the system working nicely on the bench, but once a few flights were completed, I started to have trouble and it seemed that I was constantly adjusting them to keep it all working. The better way would definatly be a separate servo for the nose unit! I would probaly go with air if I were to do it again. I have a few photo's of my Arrow but I seem unable to load them onto the forum. Is it right to click on the UPLOAD button? I have tried this and it takes forever then says page not found? Matt.