If you've ever wanted more control over your engraving vise, here's the good news: Greptile Gripping Material by 3M
This stuff is incredible! Wrap it around the back of the jaws and the sides of the rotating half of your vise- wherever your vise hand touches- it's like power steering! Hands a little sweaty in the summer or dry in the winter? No problem. If you'd like to tighten the vise rotation, but then have difficulty turning it, this will fix that, too. I've had it on mine for years and will never work without it again. You could even try it on your handpiece -personally I thought it was overkill, but you might like it.
Now here's the bad news: It's been discontinued by the mfr and you'll have to scramble to find any from baseball & golf retailers. Enough tape for a vise is about $7.00-$9.00 (If you're really hardcore you could buy a matching glove for super traction!)