What's a Roto/Carve?  It's an add-on to a table saw that allows the operator to duplicate a carving or a spindle.  I recently purchased one of these along with several other tools, but now I'm intrigued.   I didn't get a manual or the video mentioned in the ad at right from 1991.  If you have any info on this please let me know at MrToolHunter@gmail.com  Thanks!