Hi Mike,with air in the system, full pressure, is what i mean,t i have found that the front leg will not retract with finger pressure on the front leg stopping the others from going in as well,by putting pressure on front leg i am simulating the force of air on leg when flying,if i slow model up in the air, pull the nose up and hit the retract switch they go up,it seems that the air pressure on the front leg stops the retract from coming out of the lock when retracts are down!!diffiecult to explain but i hope you get what i mean,i wondered if every one is like this or just mine regards Keith W