HP 98568A Installation Instruction page 43

HP 98577 A VMEbus Expander
15. Press the Expander onto the two guide posts, then gently press it onto the
COllnector.
1 G. Check to see that the connector is mating properly, then press the two
together. If excessive force is needed, the alignment is not correct.
17. Now locate the two captive screws which fasten the Expander to the
COlllputer. They go through the Expander bottom and into the slotted top
cover.
Figure 2-18.
Connecting Screw Holes
18. Tighten the two screws with a large, fiat-blade screwdriver. Make sure they
are tight, but don't overtighten them.
Adding Expanders 2-19