For X22 - IBM ThinkPad X20 Hardware Maintenance Manual

2. Align the tabs of the keyboard with the corresponding
slots; then press the keyboard until it snaps into place.

For X22

Step Screw (quantity)
1 M2 × 7 mm, Nylock-coated
(3) BK
Chapter 3. ThinkPad X20, X21, X22
1
Torque
19.6 Ncm (2 kgfcm)
61