Lenovo ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual page 90

b. Loosen the screw and then remove the system board.
Step Screw (quantity)
12
M2 × L2 mm, big-head, nylon-coated (1)
Step 2. Install the system board in reverse order.
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ThinkPad X12 Detachable Gen 2 Hardware Maintenance Manual
Color Torque
Black 0.181 Nm
(1.85 kgf-cm)