Apple Macintosh Performa 6400 Series - Manual (Page 171)

7 Pull the logic board all the way out and set it on a clean, flat, stable surface. Rest the end
of the logic board on a thick magazine or a thin book to protect the components
underneath.
What you do next depends on whether you’re installing a DRAM DIMM or a
High Performance Module. Skip to the section that pertains to the item you
are installing.
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Rest the logic board on a clean, flat, stable surface.
Place a thick magazine under this
end of the logic board to help
protect the components
underneath.
171 Installing Additional Memory