I found a good deal on a 6600AB (anti-backlash) on ebay so I decided to check it out. When it arrived, there is a plate on top across the spool that lifts up with two small metal bars. I am unsure if the line should be threaded across these bars for the AB feature or not. No paperwork. Has anybody ever used these reels, and can you explain how it should be rigged? For now, I am simply running it through the level-wind as normal and using it as a standard 6600. I read a post awhile back that bragged on the anti-backlash feature, but I am unable to find it now. I will send a review once I learn how to use the features. One thing so far is there is no bait clicker, which I knew upfront, for those that feel this is a must have.