take the servo out, put on a servo horn and attach a pencil or something else long like a knitting needle to it securely, clamp servo so the body cant move and put a piece of card in front of it, mark the centre position then operate the servo in both directions repeatedly, to see if it centres exactly to this mark. if it doesnt centre properly every time you know you have a problem with either the pot in your servo or the pot on your radio. use another servo, doing exactly the same thing to confirm whether its the servo or your transmitter. you will be surprised how many servo's arent that accurate around centre, and using a long extended arm highlights it a lot. you will see it much more with servo's that have been used in nitro cars as the pots are affected quite badly by a tiny amount of fuel ingress. on an innacurate servo as long as its not too bad you can get by sometimes by using a shorter servo arm and extending the end points on your transmitter without losing steering lock.
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