Apple PC Serial and Parallel Card - Manual (Page 39)

18 If you removed the security bar earlier, replace it now.
Note: The computer in the illustration is a Power Macintosh 7300. If your
computer did not come with a security bar, skip this step.
Place the security bar under the front panel and tilt the bar so that the hook
slides into the slot. Then reinsert the screw and tighten it into place.
IMPORTANT Do not overtighten the screw.
19 Reconnect all equipment.
Reinsert the power cord and all other equipment cables.
You are now finished installing the card.
What’s next?
Next, go to Chapter 6, “Updating Your PC Compatibility Card Software.”
Then go to Chapter 7 for instructions on connecting equipment to your
PC Serial and Parallel Card.
Security bar
Install the screw in the hole on the underside of the security bar.
39 Installing the Card in a Power Macintosh 7200, 7300, 7500, or 7600