Harken 7413.10 MKIV Jib Reefing & Furling built after Feb. 2009 - Manual (Page 26)

Slide halyard swivel above feeder. Place
feeder in foil recess. Push screw down
so tab catches under foil. Tighten screw.
Note: Screw will turn with some difficulty.
It is plastic-coated to prevent loosening
due to vibration.
IMPORTANT! When removing screw,
loosen no more than one full turn.
Slide screw up and remove feeder.
Assembly Feeder/Final
26 MKIV units 3, 4
Check foil height at top; set and secure
using hex key.