Hi im setting up a Stark 12 cell tunnel . I have a Futaba S3305 metal gear 100 oz torque servo . Do i require dual push pull steering? I was thinking about using the Sullivan nyrod system as there is no room to set up a Dubro 4-40 pull pull cable with the Hangar 9 medium wheel system or can i just use single steering with a solid 4-40 pushrod ?