Cisco Prisma II HD-LRMW Installation And Operation Manual page 49

Gently slide the module into the chassis until its power and
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communications connections join connectors on the midplane bus. Do not
force the module into the chassis. If properly aligned, it should slide in with
minimal force.
Tighten the screw at the top of the module to secure it in the chassis. Use a
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3/8-in. flat-blade screwdriver to secure. Do not over-tighten.
Fill any unused chassis slots with module blanks to help ensure proper
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cooling air flow.
Installing the HD Module in the Chassis
25