I have a radial pin so I just got a shaft that fit, the rings don't match. Predator was nice enough to give me a choice in what I wanted and I thank them for sending me their product. My cue was 18.5 oz. now it is 18 oz. when I use the Z shaft. I would imagine it would make a huge difference if you are buying the shaft to go on a heavier cue. It may make it feel extremely butt heavy. I think it didn't matter too much on my cue because it was light to begin with.
Sarah
