Not sure if you were aware of this, but the box can be adjusted. Remove the cap nut that sits above the large star shaped lock ring on the top of the box, then remove the lock ring. Using a slotted screwdriver, turn the exposed screw clockwise until it stops, then back it off 1/8 turn. Replace the lock ring and cap. Doing this takes up some of the play in the box. Sometimes it helps, sometimes it doesn't...but it's worth a try.