I'm considering stacking a few very small boards with some M1.6 brass standoffs (the smallest standoffs I could find). To decrease the space between them even more, I could instead make a custom space with some M1.6 screws and hex nuts between the boards or even shorter like M1.4. However would the brass spacers be more suitable because they are "anti-short" and are more electrically friendly? Am I risking the circuit with the custom version?