TWEAKING DIVING PLUGS
If you are using a lure that isn’t running correctly, maybe wandering to the left or right or popping out from the surface, then tune it to swim in a straight line. To do this, carefully bend the lure’s metal eye ring in a direction that counters the direction in which the lure is swimming. For example, if a lure is swimming to the left and pops out from the water, then bend the eye of the lure to the right. And conversely, if the lure is swimming to the right, bend the eye slightly to the left.
Hold the lure firmly in your hand and, without twisting the eye, bend the eye ring over to the left or right with a pair of pliers. A little bend in the eye can make a big difference in the way the lure tracks. For the same reason, I prefer not to use snaps or snap swivels when trolling lures because the weight of the snap sometimes upsets the delicate action of a lipped lure.