I have a black widow that I had drilled a couple of days ago. Its has the exact same drill in the picture, except maybe the pin, cg, mass bias are lined up better. I assume you want the ball to handle a little more oil, or get into a roll a little earlier. Do it, you'll love it. I threw a 267 the first game out with it. It handles a nice amount of oil. I'd say medium/heavy. I don't have a need for my pain now. I have a heat blast (symetric) with the same drill and I use it for medium/light. I threw it without the weight hole first, decided I needed a little more flair, put one in and took the shine of the ball. Right now its my first ball out of the bag along with my doom and then my Black widow. 2cents