Join Date: Jun 2005
Location: New Orleans
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since it's definitely slab reefing, you'll figure it out eventually, and at the dock on a calm day is best for starters.
You need something (a hook, or a block and tackle) to hold the "new" tack grommet in place against both the upwards forces of the halyard and the aftward forces of the foot tension of the sail.
At aft end of the boom, typically there's a line coming off a block or sheave which you will lead up through the leech reefing cringle (which will become you new outhaul cringle), then back down to some fitting near boom-end. The other end leads forward along (or inside) the boom, to where you'll pull on it for tension when reefing. It's usually called the "jiffy-reefing line", and you want good tension on it since it's being pulled both inward and upward and has to provide you good leech and foot tension, and give you a fairly flat sail shape since you'd be in heavy air conditions when you reef.
Then the last thing is to tie up the loose sailcloth with the intermediate reef point lines. I often skip this, if the sailcloth is well bunched-up and not blowing around.
You have good advice above, and once you've figured out all the "spaghetti", you'll find the "slab, a/k/a "jiffy" reefing is pretty easy to do.
In the "old" days, all there was was the series of reef points to tie around the boom, difficult, took all day to take in or shake out a reef, and gave a horrible scalloped foot and baggy sail shape.