1
I have to say the most important place for weight to be on a butterfly knife is the handles, the heavier the handles, the slower the effect of inertia upon bringing it down from the air for finger rolls and aerial maneuvers. It's basically a must, for such balisongs as the spyerfly and Benchmade Model 51 it is basically impossible to do more than one or two finger rolls before it will fling away from the hand, far too much trouble for an expert user.