It really depends on your bike. I have a thin wire that loops to the top of the front wheel fork, which matches the color of the frame. The problem is trying to make it aesthetically pleasing and not too junkyard looking. For the bolt and nut that is currently on there you can probably double nut it with a lock nut. But, I would add one more level of security separate from the current bolt. You could drill two small holes, place washers underneath, and run a steel cable tie above the top of your front wheel fork. Paint the cable ties black and you will hardly notice it is there.