Oki PT340 Guide De L'utilisateur page 31

5-2-1 Attaching the Separator
(1) Align the three lugs of the supplied 58mm width separator with the
corresponding holes on the printer body, then push it into place.
Caution: Push the plate until it locks with a clicking sound and confirm
that the top side of the separator is horizontal.
Caution: When moving the separator follow the instructions in the
Special Mode section to set the paper width and align it with
the printing area.
(Refer to 9 Special Mode: 9-2. Changing the Setup.)
58mm Width Separator
Setting Hole
29