Oki OKICOLOR 59296702 Handy Reference page 26

8 Peel the tape off the bottom of the cartridge.
9 Insert the left end of the toner cartridge into the toner well,
placing the recess in the end of the cartridge under the tab
on the image drum.
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26 OKICOLOR 8
10 Lower the right side of the cartridge, aligning the slot
with the ridge in the image drum, then push the colored
lock lever back until it stops.
11 Remove the protective paper from the image drum.