I am nearly finished with replacing the ball studs and rod ends with the Team Associated and RPM solution - a precise fit, I would say.
The only thing where it is hard to replace the ball studs is the servo arm and servo saver, where the countersunk screws are used due to limited space. So here the solution would probably be to keep the original Durango balls and use some better rod ends to eliminate any play. Does anybody know if the Kyosho hard ball ends would fit the Durango balls and be better than the Durango ones?
link