What you need
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Use your fingers or a pair of tweezers to grip and pop off the thumb caps from the front of the controller.
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Flip the controller on its back.
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Remove the six 11 mm screws from the back cover of the controller using a Phillips #0 screwdriver.
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Flip the motherboard to the side with the joysticks.
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Use a soldering iron to de-solder the points of the left side and top side of the joystick modules.
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To reassemble your device, follow these instructions in reverse order.