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The video is a little dark, but a close watch or two, will clarify how to rig this up to allow the stinger hook to trail behind the tubing. The trailer hook trails behind because, in this instance, there is a knot that snugs up into tubing at the rear of the fly. This allows the hook to trail behind.This is a different technique than the trailer being attached via doubled over stiff line that is run from the shank to the hook (spey fly, but not tube fly).

Tandem Tube Intruder (http://www.speypages.com/speyclave/showthread.php?t=31438)