Actually they're valuable in the right hands. When I'm looking at a vintage gun for sale I always ask what kind of tool they used to measure the choke. Often they've listed it as cylinder/cylinder. If it was one of the drop-in gauges then I know there's a pretty good chance the gun has more choke than the seller thinks. Some years ago I bought a great 32" Parker that was listed for sale as improved cylinder. I made the inquiry, knowing those early guns were generally way overbored. The seller had used one of those awful tools. Well, most people were turned away from it but I took the chance. Low and behold it carries original .035 chokes in both tubes and the gun is close to being in new condition! Lesson learned.
