Most fishing lures come from the manufacturer configured in such a way that your bait should move in a straight line from where it lands in the water after you cast it to its' final point of retrieval. While this is normally the case, you may need to tune your lures to get their best performance in water.
If your lure is not swimming straight (pulling to one side, swimming on the surface, rolling in the water, or otherwise not preforming as intended), you may need to tune your lure. Tuning your lure is a fairly simple process, but may take a few attempts before you get the desired results.
This is accomplished by making adjustments to the eyelet where your line gets tied to the bait. You want to make small adjustments using needle nosed plyers, gently turning the eyelet in the direction the lure needs to go to swim straight. Bend it, re-test it, and repeat this process until the bait swims straight. Remember to do this in small increments as you don’t want to overcompensate, and pass the point in which the eyelet is in the perfect position for straight retrieval.
In short, here are the general instructions in tuning your bait: If the lure swims to LEFT side, bend the line attachment eyelet to the right; If the lure swims to RIGHT side, bend the line attachment eyelet to the left.