Apple Macintosh LC 630 DOS - Manual (Page 166)

3 If you removed security screws earlier, reinsert them now.
4 Slip the three hooks at the base of the back panel into the grooves in the computer case.
5 Swing the back panel up and snap it into place.
Snap the plastic back panel into place.
Slip the three hooks on the back panel
into the grooves in the computer case.
Insert security screws here.
155 Installing an Expansion Card or Memory for the PC Environment