Leonard has been modifying the frames to screwless on guns he has been engraving for the past few years. If you look on Leonard's web site, there is a series of pictures on the right side that shows his process. http://www.francolini.com/
I will begin with a brief recap of what this tutorial is about and how it came to be. Back in early June at Scott's Engrave-In I showed some pieces that were cut in what I usually refer to my "double bevel" style. One of the engravers indicated that it was something also called "transition style...