I was buying something else and came across the zwing, again, and thought it might be useful for trolling lures at depth for bluefin. Don't need a downrigger arm or anything, just drop it over the side (with some padding), and send lures or trollable baits down. We've used shower curtain rings attached to release clips or rubber bands so you send lures down and up without having to lift the zwing up. Has anyone used one for trolling for tuna? Seems we are usually just riding around when searching for bluefin with no trolling rigs out. Maybe this would help?