Notice:
The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
I would venture to say that it looks like a sliding goose neck. It attaches to the forward boom end and then the sail slot of the mast track. You will want at least one sail stop and maybe two. Best of luck.
Yes, The line attached would go down to a cunningham. Though that line looks like it might be just a little short. Most likely, the other end of your goose neck is still attached to the booms forward end. If not, you can get a replacement from CD. (Catalina Direct).
I wonder where the rest of it is, then. I'll check the boom I guess. Would this setup be for a cunningham?
You might find a fitting permanently fastened to your mast for the boom to attach to at a fixed height instead of being able to slide up and down. This part that you've shown would then be superfluous.
With a fixed gooseneck you would need an actual cunningham, which is a cringle above the tack for a line to haul down on the luff and tension it. It's much more effective than just tensioning the halyard.
With a sliding gooseneck you raise the sail to full-hoist and then use the boom down-haul to tension the luff. This way, gravity is working with you instead of using the halyard alone. I installed a multi-part tackle to do this, but I don't really use it anymore (it seemed to help with the weary old mainsail that came with the boat). The short piece of rope attached to the slide in the picture could be tied-off to a cleat on the deck or on the mast.
Note: with a sliding gooseneck you should have something to hold the boom down.
The trouble with a destination - any destination, really - is that it interrupts The Journey.
Lee Panza SR/SK #2134 San Francisco Bay (Brisbane, CA)
As in this case, it's often helpful to us to know a little about the boat--for example the year. Until the late 80s, C-25s were made with sliding goosenecks, and this is the "sliding" part of that. The line is the downhaul, which is attached with a stopper knot to the bottom of the slider and can be tied off to a cleat you probably have low in the mast slot. The pin that holds the boom casting to the "clip" on the slider (or is that a bolt?) looks a little long--it should be a clevis pin just long enough for for the clip (with a cotter pin or ring). A longer clevis pin or bolt holds the sail tack at the top of the boom casting.
Dave Bristle Association "Port Captain" for Mystic/Stonington CT PO of 1985 C-25 SR/FK #5032 Passage, USCG "sixpack" (expired), Now on Eastern 27 $+!nkp*+ Sarge
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.