I havea TREX 600, I have been having wierd tail vibrations. not up and down but left and right, it isn't very noticeable, but the vertical stabalizer is vibrating like crazy. Could it be the main gear causing it or bearings? Everything is balanced, which is making it wierd. I noticed the 90*arm for the tail swash/servo had a bit of playbut I'm not sure if that is causing the issues. please any and all suggestions would help, I'll check everything!!