Well, I cleaned up the old magnifying glass, re-calibrated the old micrometer, and took a closer look at the screen. I measured the screen squares as 1/16" (.0625") and the overall thickness as .007". If and when I buy one from McMaster-Carr, I would get a flattened mesh expanded metal sheet with diamond openings. Part #9302T141 looks like it would work. Or part #9305T86 if you like aluminum better than carbon steel.