Harken 7413.10 MKIV Jib Reefing & Furling built after Feb. 2009 - Manual (Page 13)

MKIV units 3, 4 13
Preassembly Confirm Foil Length
Line up bottom foil so foil clamp is centered or just
below center of notches in bottom foil.
Confirm foil length by laying foils alongside stay
with turnbuckle components.
Pull stay out so it is straight. Attach Harken toggle
to bottom of stay. Make sure toggle straps are
straight. Adjust turnbuckle so that length of stay
with Harken toggle will fit boat. Turnbuckle should
be one-half to two-thirds open to allow for rig
adjustment.
Line up drum assembly so holes below drum line
up with holes in Harken toggle. Make sure toggle
is tensioned when measuring.
Note: Position top foil so that including top cap,
the foil will ride 25 mm (1") below terminal. If wire
fitting at top of stay is swage, foil must ride just
below shoulder of swage. Mark cut line on foil.
Wrap tape around foil as a guide so cut is straight.
Unit 3 only.
If 7304 halyard deflector is
used, add 25 mm (1").
Unit 4