HP CM6049F MFP - Manual (Page 220)

5. Unpack the new cartridges and remove the plastic packing lock from each one.
6. Hold the new cartridges so that the arrows on the cartridges align with the arrows on the staple
cartridge unit and insert them into the unit.
7. Pull the handle of the staple cartridge unit toward you and rotate it downward to its original position.
Lock it into position by pushing in the handle.
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8. Push the staple carriage back into the booklet maker finisher.
204 Chapter 14 Manage and maintain the product ENWW