It's done. I posted 3 photos of the setup and the finished groove. In addition to the lack of a groove, the holder area was stained wood, where I prefer flat black paint. The S&S ribs are not tall, so a shallow groove sufficed. The old carpenter's adage "measure twice and cut one" was far outdone today, as I must have measure 15 times before I attacked this antique with a 17,000 rpm bit.
Originally Posted by photomc
Here are the three photos, for those whose interest exceeds their initiative to go to the gallery.