IBM pSeries 690 Service Manual page 966

The following illustration shows the location of the bushing in the cassette.
13. Insert the bushing-lock pin into the hole in the bushing, and push it in until it seats as shown in the
following illustration.
946 Eserver pSeries 690 Service Guide
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1 Location of the Installed Bushing and Bushing-Lock Pin
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1 Bushing-Lock Pin