The counterweight is inherited from the V1 prototype for the time being. As we already know, the things hanging off the back of the tonearm
matter a lot. The adventure we went through with the counterweight configuration is worthy of a separate post, but this would have to wait until V3. The next prototype will have a very different counterbalance arrangement.
Another subject worthy of a separate post is the influence of the vertical bearings on the sound. V1 used zirconia ceramic. The two V2 prototypes use silicon nitride and normal steel bearings. Sonically, they might as well be two completely different arms.