Lenovo ThinkPad X220 Maintenance Manual page 106

Removal steps of LCD rear cover and wireless antenna cables
Step Screw (quantity)
1
M2 × 3.5 mm, wafer-head, nylon-coated (1)
In step 3 , release the antenna cables from the cable guides of the rear cover.
100
Hardware Maintenance Manual
1
Color Torque
Silver 0.181 Nm
(1.85 kgfcm)