Just think carefully about placement of that dummy flasher. You want it sufficiently close to your lure that it attracts fish and triggers a bite, but not so close it tangles with the fishing line and lure. Inline flashers like Agitator that just spin on their own axis are a good choice for this application. You can drop them back 20 ft off the ball so they're closer to the lure; if you did that with a conventional flasher it would have such a large arc it would either foul the line or be too far below the lure to be meaningful.