Avery Dennison Monarch 9825 Operator's Handbook Manual page 34

12. Remove any slack in the ribbon by turning the take-up reel clockwise.
13. Hold the printhead assembly by the printhead tab while pressing down on
the printhead release.
14. Close the printhead by pressing down on the thumb well until you hear it
click into place. Close the cover.
Thumb Well
3-4 Operator's Handbook