Harken 7413.10 MKIV Jib Reefing & Furling built after Feb. 2009 - Manual (Page 30)

Commissioning—Unit 3, 4 Pendant/Halyard Restrainer/Halyard Tension
30 MKIV units 3, 4
Halyard Deflector/Halyard Restrainer
To prevent wraps, jib halyard must pull slightly to rear. On most boats, halyard
lead angle is acceptable if halyard swivel is raised to top of foil.
On some boats halyard sheaves are located too close to headstay and
a halyard deflector or halyard restrainer must be used.
Halyard restrainers should be used only when required by masthead
geometry. Restrainers tend to limit sail luff length, and can cause problems
if not installed properly.
If your boat needs a halyard deflector (Unit 3 only), use part no. 7304
or a halyard restrainer (Unit 3 only), use part no. 945.
Restrainer should be mounted as high as possible on face of mast.
Position restrainer so that foils will not hit it when under load.
The restrainer should deflect halyard as little as possible or you might
experience difficulty in tensioning sail luff, have friction when furling, and
cause possible damage to foils. To decrease deflection angles, shorten sail luff.
Tip: Boats used in charter service should have a halyard restrainer,
regardless of masthead geometry.
Halyard Tension
The jib halyard should be firm, but not too tight.
Tip: The luff foil system supports sail along its length so halyard
tension is used only to shape sails, not to support them. Use enough
halyard tension to remove some wrinkles along luff of sail. Do not
tension halyard enough to cause vertical wrinkles in luff of sail.
Tension to adjust position of draft in sail to suit sailing conditions.
Halyard should be firm, but not tight. If in doubt, release halyard
tension. To protect sail, ease halyard when boat is not in use.
Pendants
If the your sail luff is not long enough to position halyard swivel high enough to
create an 8 – 10° angle as shown, you must add a pendant. Pendants should be
made of plastic-coated wire and be permanently attached so sail height will be
correct. Adjustable-length pendants are not acceptable, as they might not be
adjusted correctly during a sail change.
1. Raise sail, but do not attach tack shackle.
2. Position halyard swivel correctly near top of headstay.
3. Secure halyard.
4. Tie a piece of rope to sail tack.
5. Lead line through tack shackle on furling drum.
6. Tension sail.
7. Measure distance from tack shackle to sail tack and permanently
attach pendant of this length to head of sail.
8. Repeat procedure for every jib in your sail inventory.
Halyard restrainer
Halyard deflector
Unit 3 only
Unit 3
or
Unit 4
Unit 3 only