Epson Progression U12 - Manual (Page 110)

Follow these steps to install a disk drive in the external bay:
1. Locate the following parts included with your computer:
Two metal drive brackets
Four retaining screws (with attached flat washers)
Two nuts (with attached star washers)
Small wrench.
2. Attach one bracket to each side of the drive, as shown below.
Secure each bracket loosely with two of the retaining
screws. (Do not tighten the screws now; you may need to
adjust the drive position by moving it along the bracket.)
Installing and Removing Drives 4-7