Lenovo 53581FU - IdeaCentre K220 Desktop Hardware Replacement Manual page 26

After the Graphic Adapter is installed , install the bracket as the
following:
1. Install the bracket into the chassis so that the screw holes in the bracket align
with those in the chassis. Let the slot on the bracket clip the adapter.
2. Install the two screws to secure the bracket. Note: Use only the screws
provided by Lenovo.
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Hardware Replacement Guide
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