IBM 3270 Maintenance Manual page 613

3. Slide the disk drive in until the clearance
between the drive face plate and the front
mounting panel is 1.0 mm (0.040 in.).
4. Install the two mounting screws.
Warning: Be sure to use the same two
mounting screws (long screws) that you
removed from the side of the drive, or damage
to the drive will result.
Mounting Screws
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