Nintendo Switch Left Joy Con Sensor Rail Replacement

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Use a JIS 000 screwdriver or an official iFixit PH 000 driver to remove the four 3.7 mm screws securing the left Joy Con rail to the frame of the device.
These screws are torqued down and can be difficult to remove. To prevent them from stripping, apply firm downward force, work slowly and try a different screwdriver if the screws won't come out.

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