Dell Precision 410 Service Manual page 67

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When you replace the 3.5-inch diskette drive on the bracket, be sure that the
two retaining tabs on the right side of the bracket engage the mounting holes
in the side of the 3.5-inch diskette drive. Then replace the screw that holds the
diskette drive to the bracket. To replace the 3.5-inch diskette drive assembly in
the chassis, slide the bracket tabs into the guides on the chassis until the
bracket snaps into place.
Removing and Replacing Parts on the Desktop Chassis
diskette
drive
retaining
tabs (2)
bracket
4-11