Tighten the castle nuts enough to remove the play but allow unhindered motion.
The Super Derecho
Here is the multi tool (use the top part):
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Revo .18TM
BL Rustler
Stampede
HPI Sprint 2
put a little bit of teflon pipe tape on the threads to help hold the castle nut in the carrier. I've seen others drill a small hold and thread a set screw into the carrier so that will lock the castle nut in position. Also check the pillow balls - they like to back out of the A-arms and will throw your alignment out (first clue is the front and rear tires will toe-out as the pillow balls unscrew from the A-arms). Thread lock will help hold them in place.
I have an RC problem...