Canon imageRUNNER C3489 Reference Manual page 368

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Finisher-Y1/Saddle Finisher-Y2/Puncher Unit-M1 (Optional)
Grip the saddle stitcher unit by its handle, and pull it out of the
finisher until it stops.
Pull the stapler unit of the saddle stitcher unit towards you,
and then push it up.
Pull out the empty staple cartridge, holding it by its left and
right sides.
Saddle Stitcher Unit
Stapler Unit of the
Saddle Stitcher Unit