The blade is an improvement over my first design for paper use. The first blade had a space of about one inch between the body and the steel blade. It was easy to see that if the paper had any buckles or bulges, it would not maintain a consistent gap under the blade. Placing the blade closer to the body was a vast improvement.
Before I surfaced it on sandpaper, I assembled the whole blade and snugged up the screws to account for any stress induced deformities. It literally sticks to the plate glass I coat on.