IBM 704 - Manual (Page 171)

Removing Adapters
2. If you are installing another adapter in this expansion slot, see
“Installing Adapters” on page 143 for instructions.
If you are not installing another adapter in this expansion slot,
replace the expansion-slot cover:
Note: The tapered foot of the expansion-slot cover must fit into
the mating slot in the expansion-slot frame.
a. Slide the cover over the open expansion slot.
b. Insert the expansion-slot screw 1 that you removed in step
1c on page 152 into the threaded hole, and push the
rounded notch up against the screw.
c. Tighten the expansion-slot screw firmly (6.0 inch-pounds) on
the top of the expansion-slot cover.
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Chapter 4. Installing Options 153