A bent driveshaft could easily make the car turn to one side a little bit, as with the shorter length and increased friction caused by that, the affected wheel would not be as willing to turn at as high a rate as the rest of the components of the car. I've suffered bent driveshafts in my car too, and the only real remedy is to buy a new shaft, unless you happen to be able to bend it back to the proper alignment. If you do bend it though, beware, as the metal will have fatigued some and will be more prone to damange in the future. As for the servo, whether or not the cogs are all present, it may have been forced to a different position than it was intended to be in during the impact. Try removing it from the car and all its associated apparatus and running the servo by itself...if it continues to click, see if you can locate the sound (I know it's a tiny device, but sometimes you can still tell)...see if the motion is jerky etc...etc...
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me-- "Sometimes you feel like a nut, sometimes you don't. Sometimes I feel like the moon is made of cheese"
my Hindibonics-speaking Indian roommate--"Dawgs, do you have any idea how much bacteria that would take?"
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