Sony PCV-RS100 - Manual (Page 50)

VAIO Computer System Reference Manual 34
8 Press down evenly against the module's upper corners. The latches
snap into position, holding the module in place.
9
Reinstall any components or add-on cards you may have removed.
10
Replace the cover. See “Replacing the cover” .
!
To avoid damaging a memory module slot, move the end latches slightly
outward to relieve pressure. The module clicks into place.