Personally, I respectfully submit, although I use metal gear servos for there torque strength, I prefer nylon gear servos with a (5) pole set motor for vibration resistance on the throttle and choke of the gassers. Nylon is superior to metal when strictly looking at vibration resistance ignoring the torque strength issue, as is the case with the throttle, choke, air valve, etc. Check and see how many poles your nylon drive servo has. If it is 5 instead of 3, it makes a great servo for these applications. It will likely outlast the airframe.