I thought I'd have this back by now so I could leave feedback, but it's not going to be shipped until Monday. Here's what I did: I bought a Predator SPJU off a kid in a pool room a while back. It was beat up pretty bad and I got it cheap. I sent if off to Proficient Billiards to be completely refinished, have a new butt cap put on, and also to have a phenolic tip/ferrule combination put on it. I also wanted a uniloc joint put in the butt to make a jump/break cue. (I know I know Predators don't jump well.) Anyway, I decided against the uniloc joint and just had the tip/ferrule combination put on and the cue refinished. Since then I've read all the posts about Predator shafts and how people screw them up by putting different ferrules on them. I guess I screwed mine up as well. I'll just have to wait and see what kind of job they did on it. I called Proficient Billiards and told them to use either a phenolic combo or an aegis ferrule with water buffalo tip. Whichever is easiest for them is what they'll do I guess. I specifically told them that the cue would be used for breaking. Any comments? Did I ruin the shaft? Do you think they filled the hollow section for me?