AR488 enclosure

This is an enclosure for an Arduino Pro Micro based GPIB adapter created by artag.
See https://www.eevblog.com/forum/projects/ar488-arduino-based-gpib-adapter/ and https://github.com/Twilight-Logic/AR488.

There are two versions: One with receptables to plug the Arduino Pro Micro to the board, one with direct soldering the boards together. The latter one I haven't tested yet.

This is for a metric M3x16 screw and nut, feel free to adapt for imperial screws and nuts.