Intel 3100C Service Manual page 36

Place the screwdriver into the close slot on the CPU case
Hold the CPU tool (jig) in place and move the screwdriver
in towards the CPU. (this will lock the CPU securely in
place)
Remove the screwdriver and the CPU tool (jig)
Place the Zif plug (lock) on the CLOSE side
of the CPU dock.
33
The processor is now securely locked
into the CPU dock.