DEX408 DNX408 Servo saver

[4nd7]

Just trying to get a new build of a dex408 done and i'm having trouble with the servo saver post thread. First one that came with the kit wouldn't even attempt to do up and was obvious the nut was too larger diameter for the saver threaded shaft. Called Durango and very helpful and replacement came through the door less than 24hours later. Problem is even though this new one is doing up its got the feel like its going to let go as soon as i hit something and isn't going to last, so is there any common mods to do to this or alternative parts people are using?