I repaired two calipers with cracked plastic lenses. A regular caliper that I use for woodworking and Mitutoyo 505-626-50. With a broken caliper, the bezel came loose with a slight lever and a plastic ring kept the lens off the face. Everything fit together easily. On the Mitutoyo, the bezel also pops up when you press it lightly, but the lens pops out of the front of the bezel. The replacement is inserted, but too thick and too small. I put a few small dabs of super glue around the edge to hold it in place.