I've just found my favorite tool ever! For Christmas I asked my son to get me a vise, one with padded jaws. I was looking to make my own jump rings using a jeweler's saw and needed a tool that wouldn't mar the finish of the wire. I haven't used it yet for sawing jump rings But I just used it for holding one of my polymer clay beads for buffing.
I've always held my polymer clay pieces in my hand when I buffed them with a Dremel tool. I can't tell you the number of times that I've missed the bead and buffed my fingers, or had the bead shot off into the stratosphere when my grip wasn't secure enough. This vise takes care of both those problems. The padded jaws hold the bead tightly enough so that my hands are free to use the Dremel.
If you buff your polymer clay pieces and you do not already have a vise, I recommend that you look into purchasing one. Mine is a universal table vise that claps onto your work surface. I don't know where my son purchased it , other than it was purchase on line. But I'm sure there are a number of sites where these can be found.
My new vise on my work surface:
The bead on the right is before buffing, the one one the left is after.