Sony PCG-XG29 - Manual (Page 114)

VAIO® Notebook User Guide
Replacing a Keycap
Place the Enter keycap, Shift keycap and Space keycap as described
below. For other keys, place the keycaps in their original place and gently
push down until they click.
To replace a keycap
Enter Key
Shift key and Space key
✍
Do not use force to remove the keycaps as this may result in a malfunction.
Do not push too hard on the keycaps when placing them.
projections
spring
projections
Push down
projections
projections
spring
Push down