I bought cole jaws for my Supernova 2 at Woodcraft and love them. They are safe and reliable WHEN USED ACCORDING TO MANUFACTURER'S INSTRUCTIONS. I use the tail stock until I'm ready to do take off the final nub. Make sure you follow speed restrictions. There are specific maximum speeds for different size bowls. Penn State offered some replacement pins for the cole jaws, some that were longer than the ones that came with it. Since they were relatively inexpensive, I bought a set. They work well on something that has a deep, straight side and give more holding power. I've tried jam chucks and donut chucks and they didn't work as well for me as the cole jaws have. I'm a big fan.