Bump - just updated the page with a couple other methods.
affreeman - sorry I didn't see your questions when you posted them but it looks like they were answered. One note, though - the prussik adaptor slides up and down the spectra, so the line doesn't have to be doubled up for its entire length. If the tree are really far apart, just slide the prussik closer to the end...this should take a lot less cord than using the Figure-8 lash so you'll still be ahead of the stock system. But the stock system is still intact so you're no worse off than when you started.
Same deal for the clove hitch system that's on the page now.
One strength I like about these systems is that I don't remove any pieces during setup or teardown. It's all one piece...no threading, no looping, etc - just one click of the biner on each end, then pull to adjust. Of course, the cost for this convenience is weight.
And there are obviously other ways to do it...your cord method is one. I'd use a double larkshead on the rings to keep them stable rather than just tying them on, though. And then if you want to cut the spectra, it gets even lighter.
My first post in 2009...Happy New Year!!
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