[Notwise]

Boy - I'm really thinking about this. In what circumstances would *any* play be acceptable? Also, is it possible that ECU for the actuator is faulty or misprogrammed?

My logical path is that the actuator is wearing out, causing play, which causes vibration. If this vibration was present when the car was new, no-one would have bought it like that.

And - I'd rather have a vibration free ride than the rear wheel steering! I wonder, if it turns out to be the culprit, whether one could 'lock' the actuator so there would be no play in it..

And - I wonder, did you test for play with the motor running or off? It's possible that the actuator energizes when the car is running.