I have the exact same model Viper Platinum. Got it recently, and it took me a little while to figure out the pin. It is a Turbo Lock pin, and I have come to learn that very few manufacturers make cues or just shafts with this pin. Here is a nice page on Seyberts where you can see the Turbo Lock at the bottom:
Joints by Manufacturer
And here is another page where showing TurboLock:
How to identify your cue joint
Let me guess, you are looking, as am I, for a full size shaft, because the shaft you have is about 4.25" shorter than a standard length shaft! As it turns out, there are some Pure X models that have a Turbo Lock joint. I have also found on eBay Pure X Turbo Lock shafts only.
So, I really like the look of this cue, but can't play it out as it is. I may eventually pay $200 for a Pure X Turbo Lock shaft and hope that it fits well. I've also considered paying a pool cue maker to make a shaft with the pin insert and rings from mine.
Did you find any info since you posted a couple years ago?
