Robin, I mentioned lubing the system at the end of my first post but I think that is the most important thing to do even before hooking up all of the air lines. One or two cycles on a dry o-ring will cause a leak almost every time. Just use any good air tool oil and add a couple of drops every other flying session or so. I have a full scale Nanchang CJ6 with pneumatic gear,flaps,and brakes and that is what I do on the real thing weekly. Don