I was attending a class of Sam's at GRS a few years ago, and Mr. Don Glaser came up on a Wednesday morning, and demonstrated hand engraving a silver bracelet blank - Western Style. He did a lot of the spine engraving with a wriggling action using a flat graver. He did mention that he had a design on the boards for a WRIGGLING handpiece, that would oscillate back and forth, as well as hammer in the traditional GRS fashion. The little bit of wriggling I've done so far has made it clear and apparent to me that this action is a carpal tunnel syndrome looking for a place to take up residence. Can some one see if there is a Wriggling adapter out there for air assisted engraving? If not, it may be a worthwhile endeavor for a manufacturer to pursue. Music instrument engraving is all about wriggling. (saxes, coronets, trumpets, brass of all kinds, etc).