Lenovo ThinkPad X1 Safety, Warranty, And Setup Manual page 4

Securing the Base Module with the screw (only for the ThinkPad X1
Tablet Gen 2)
Installing a feature-expansion module (with the Base Module not
secured by the screw)
1
4
Installing a feature-expansion module (with the Base Module
secured by the screw)
1
4
1
2
5
2
5
2
3
3
6