Datamax-O'Neil E-Class Mark III Printhead Bracket and Screw Upgrade - Manual (Page 8)

14.) Place the hinge of the bracket in the ribbon carrier assembly as shown (Fig 14a).
15.) Re-install one post of the printhead cover in the bracket opening. (Fig 15)
(Figure 14a)
(Figure 14b)
Hinge should not be visible if fully installed. See Fig 14b.
(Figure 15)
16.) Set the remaining post of the printhead cover in the channel and push downward. (Fig 16a)
(Figure 16a) (Figure 16b)
After installed, the printhead cover and bracket, it should look like Fig 16b.