"Are you sure it's not rf coming down the metal pushrod? Are you on 2.4
A nyrod will stop vibrations as well so I would use that."

Never really thought about RF noise. The ball link ends are plastic and the pushrod does not touch anything metal. It may touch the firewall under vibration but that's all. I also assumed it wasn't RF noise since it only effected one servo. For some reason I thought RF noise caused interference in the RX and would effect all the servos. In my case all the other servos function normally. This is a 2.4 FASST RX. The throttle servo is close to the LiPo RX battery but not close to the NiCad IGN battery. I may push my luck a little and change to Nyrod before changing the servo. (not advising anyone else to do the same) This should tell me if it is vibration or RF noise. If I still have issues than I would assume the servo is bad from being vibrated. If this cures the problem then it's most likely it was RF noise.

David