Hey the built in ds calibration can calibrate in the middle you just need to know how it works: first when you start it you see the first screen click where ever it needs calibrated not where the dot is click about 20 times then once you did that click where the first dot is, then the second, then the third, then when it goes to the the next screen with the four dots that is not the calibration screen that is the test calibration screen it will never automatically go to another screen once your at this screen click finish/done. That is it hope i helped.
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