What's this for?

[Scooter]

Getting close to 'good enough' on my project WWP-19 and looking closely at the main I'm trying to figure out what this grommet is used for. Any ideas?

Also yes, I do need new sails.

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[JerryC]

For the cunningham. First reef is above it.

[Noemi - Ensenada 20]

Downhaul 

[Wayne Howard]

Downhaul 

Cunningham!!!   

[Scooter]

Wow, I had no idea. I'm not sure if this is standard, but I think the downhaul connects directly to the gooseneck on the WWPs; so I was pretty sure that wasn't it. And the reef is pretty clearly the next one up. Thanks, everyone!

[JerryC]

Tack goes to the gooseneck. Cunningham/downhaul is separate and used to tension mainsail luff and depower. You can get more purchase (maybe 2:1, or more) with a downhaul than cranking on the halyard. Just another adjustment, along with the outhaul...

[Scooter]

Ayup, tack to the gooseneck, gooseneck to the downhaul, Cunningham is completely separate. halyard and downhaul give about 8 inches of play as to exactly where the main sits. Probably best to run the main as high as the halyard/track allows then tension with the downhaul?

[Noemi - Ensenada 20]

Scooter, you're relatively new here....

A long time ago, there were some running arguments about what to call things, the most virulent being the one about cunningham/downhaul. 

My post was a joke.

[Scooter]

Got it. I'm surprised that didn't make it into the captcha questions. : )