1. If a boat is equipped with hardware for two reefing lines, I'm now thinking it could be used either two separate single line systems for different reefing points, or two different lines (one each for clew and tack) to secure a sail to the same reefing point. Do I have it right so far?
2. How do you rig your lines for the two-line system - specifically, is it a matter of running the reef line through the eyelets and leaving a knot, or do you tie a loop around the boom and through the eyelet?
1. Yes, that would work, depends on where all the pieces are located.
2. The latter. It's important, especially for the clew which gets much greater load and at a severe angle (45 degs.), to have the lines pulling down on both sides, or else the clew cringle will get whacked out of shape. No different than single line or basic individual line jiffy reefing.
Guys, there have been a number of discussions about this on this board. Suggest you do a search on "double line reefing" I also understand a Google works well on it, too, since there was a link provided by someone here who lined to a discussion with diagrams, drawings and maybe even pictures.