Actually the first version was more correct, because the chain(really its not an chain, more like a belt) is a vital thing for an Van de graaf generator.
Make a block, and make its density 100 and attraction 3.1 then have it collide with A, then place your pressure spawner thing over it, and tada. You may modify the amount of balls spawned by changing density/attraction of the block.
Actually no, black holes dont look like that.they have such a great gravitational field only radiation comes out, and we cannot see radiation. Even light cannot escape black holes, so they are very hard to spot.