I run them off riggers and a thumper rod. You can run them behind divers BUT, the slow speeds + divers + fishing close to the bottom, is not worth the hassle IMO. I run my riggers until they hit bottom, bring them up one foot, let them settle for a minute, drop them to the bottom again, lift them one foot and then keep them within 3' of the bottom. On the thumper rod, I run the weigh 4' down from the 3 way so the cowbell and lure stay off the bottom if it bumps. Run them slow. 0.7 - 1.8 are the speed (at the ball) tolerance of most cowbells.