but here is a good diagram/pic of them from the Nacra assembly manual. This is the d loop (in the pic, the black rings with the handle in the center are the "d" rings) to a yellow line going through the eye of the trap wire to a plastic piece the line is wrapped around and you can adjust the line by changing the wraps then tied to the bungy. there are different ways to do this, but hopefully this will help you out some. page 7 cut and paste the address because the whole thing isn't underlined
http://nacra.us/nacra/17,18,20%20Manual.pdf