Yesterday Montserrat asked about protecting your fingers while sanding Intatsia pieces. A few years back I did a JGR piece that contained many individually cut grapes. After trying to shape one or two grapes on a pneumatic sanding drum, I realized I needed to come up with a better way. I remembered seeing a tip in an old Wood Magazine that would solve my problem.
The second picture shows the hardware I used. I don't remember the exact size fitting but it looks like a 1/4" x 1/8" brass coupling found in the plumbing dept. and a # 4 x 1/2" screw. The next picture shows the screw installed and a handle I turned, then the hardware installed into the handle. The next picture shows a grape piece screwed into the jig. Next I show it in use on a 1" belt sander, although I would of used the pneumatic drum mounted in my mini lathe. The rest of the grape shaping and sanding went easy!
You could also use a wooden dowel and a longer screw. Cut the head off of the screw, drill a hole in the end of the dowel and epoxy the screw into the drilled hole.