When you said you have the retract servo, did you mean you have a retract servo, or just a plain servo, the reason being is I hope you bought century jet retracts or robarts, not mechanicals, the mechanical retracts are not strong enough for the TF kits. I wouldn't recommend the mechanicals on anybody, they takeup too much power from the reciever battery and the linkage and setup needs to be real heavy duty, so it adds extra weight. But on a 8-9 LBS warbird, they will suffer in time. Just a for warning.