I add a stop bead, go to a loose area, make at least 3 turns, but I do more on the way back to my position. I don't have a set place or turns i take, that depends on a few factors. But in doing this you have essentially knotted yourself (without an actual knot) in the beadwork and as long as you're 3 u-turns or more away from starting or ending thread you should be good and not worry about coming loose. If you weave loosely, make a few more turns, you'll be able to feel it once you're locked in.