Apple PowerBook G3 - Manual (Page 136)

16 Move the keyboard back toward its original position, and then slide the tabs at the top
into the computer’s enclosure.
Hold the keyboard no more than an inch above the enclosure to avoid
straining the cables.
17 Lower the keyboard into place.
If part of the keyboard doesn’t lie flat within the enclosure, gently press that
area down with your hand.
18 Remove the cloth from the display.
Gently slide the keyboard back into the computer. These tabs go inside the computer.
136 Appendix C