Acer Aspire M3-581T Service Manual page 158

3. Replace the 2 screws of the ODD bracket.
Figure 3-121. ODD Bracket
Table 3-30. Screws
Step
ODD Bracket Assembly
4. Push the ODD completely into the bay until flush with the bottom case.
Figure 3-122. ODD Module
3-74
Screw
M2*2.5 2
Quantity Screw Type