I've never used Roto Grip equipment before, but have been contemplating it lately. I was able to pick up two NIB 16 lb. Mercurys for $70 shipped, so i figured why not. I am planning to drill one pin on axis because i need a control ball anyways, and i'm not sure how i'm gonna drill the other one. What should i expect from this ball? I've heard its very smooth and controllable.