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It has an d loop to connect to a harness and then a rope adjuster to change the position of the d loop.

but does the line from the d loop go through an eye on the trap line to a plastic thingie (rope lock) then to the bungy? Or is there a line that goes straight from the d loop to the trap thimble? If so, I wonder how it would attach to the bungy.
Or are you talking about a block on the trap line that the line runs through?