Started riding again after 25 years. Back then someone marketed a device called a 'nail catcher.' It was simply two small wires; the first fastened to the frame at the brake bolt. The second was shaped like the tire, riding on it or a hair above it, held to the mounting wire by narrow gauge surgical tubing.
Ought to be fairly easy to make one, but I wondered if anyone else has used these or knows if they are still made. With the 'nail catcher' mounted over the rear tire only, I rode daily in L.A. for 3 years without a flat. Without it, I got a flat in a week.