I use the Ronstan Constrictor clutch as a second inline clutch for my main and jib halyard, and my boat has been inspected for the NAs with these clutches installed. The advantage is they do not chafe the halyard cover and provide longer halyard life. I had a halyard 6 weeks old that the cover parted at the Spinlock clutch while using a new 3Di main in big winds. That is when I decided to install the constrictor clutches. I had previously changed the teeth in the Spinlock clutches to prevent slipping. When using the Constrictor inline you set the Constrictor clutch first, then close the Spinlock. If easing, open the Spinlock first, then ease the Constrictor.
The photos below show my installation. The Constrictor is thru-deck mounted about 12" forward of the Spinlock so the deck ruler tape is visible. If the clutches were together, the constrictor section covers the halyard there and would require the tape to be moved forward since you could not easily see the marked halyard immediately forward of the Spinlock. Be sure to epoxy isolate the holes drilled and use a G10 backing plate underneath since the deck is not reinforced there as it is under the Spinlocks.
Secondary clutches of various types are class legal, please see copy of ruling by Rick Hanson below.
The Class Measurer was contacted to determine if two requests were allowed by Class Rules.
1) Is a second clutch allowed for both the main and jib halyards?
Answer: A second rope clutch is acceptable as it was asked and allowed previously by the Class Measurer as a method to prevent halyards under tension from slipping through the rope clutches. Alternate methods acceptable to achieve similar results include splicing extra core or covers in the halyards by the clutches, or replacing the teeth in the Spinlock clutches with model 0610 to replace the 0812 so the clutch grabs better.
2) May the forward hand rails be shortened so that in-hauling may be done across the cabin top without having to also clear the handrail?
Answer: Shortening of the handrails is not allowed per Class Rules paragraph 4.1 which states "Standard factory supplied equipment, including, but not limited to, railings, stanchions, and furnishings, except as listed in section 4.3, shall be maintained and will not be removed, relocated, or altered when racing". This modification may also be a safety hazard since the full extend of the handrails would not be available when needed for sailing in heavy seas.
What is the process for proposing a rule change that would accommodate these? In the interest of time, recognizing rule changes probably take a while, I'll go ahead with the Spinlock replacement, but I am curious for future.
Thank you for the consideration.
As far as class rules, it is no problem to switch to a XTS in series with the factory clutches, but why?