I have a Predator 314 precat shaft. It's the Predator uniloc joint with black collar. I was told it has the typical Predator taper roll. Tip does not leave table. The light does change under shaft when rolled. Has a Triangle tip on it. It is 12.80 at the ferrule. Probably could be turned down to get rid of the roll. No real bluing on shaft. Best offer. PayPal shipped USA Thanks Michael