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You have sail-slides stitched to the luff's boltrope, and the slides go into the track on the mast. This is not at all unusual, in fact it's pretty standard. Another, less common way, is to forego the sail slides and feed the boltrope directly into the mast track. But this tends to introduce a lot of friction into the raising and lowering of the mainsail, so you tend to see it more on dinghies/daysailers, and some raceboats with plenty of crew.
It's also not unusual to have a sail luff that is a little bit longer than the hoist. If your halyard is at full hoist, then you would take the bagginess out by pulling down on the luff with the cunningham.
The cunningham is a line attached to the base of the mast, usually with a small hook at the other end. The hook gets inserted into the cunningham cringle, which is along the luff normally a foot or so above the tack cringle (but below the first reefing cringle). The cunningham tackle often has blocks to increase purchase (much like a soft vang), but not always. The idea is to pull down on the cunningham cringle, and take the bagginess out of the leading edge of the sail, especially in heavier conditions.
Definitely get that vang rigged too. It will help you to shape the sail and take some working load of the mainsheet.
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Pacific Seacraft Crealock 31 #62
NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT