i have two power machines--- one is drilled 3/ 3/8 x 3/ 3/8 strong drill for speed dominate player. and the other is a alittle milder ( not to much though) in my opinion this was the best track ball made in san antonio. it hits extremely hard. has great carry, most of the time. its not a flood ball, or if the backs ends are oil filled, but its very good on med oil. to light oil. these are my go to balls. i like this ball so much i will probally get another one, before they are all gone, and save it. you will love this ball, just drill it properly. other track balls i have ---- mean machine -- rule gp2 -- phenom unleashed -- voo doo.