Fully reversible mod, no cutting, filing, etc required. Fits the IBM Model M 1392595 terminal keyboard and many other variants while still utilizing the stock controller board (converting protocol using Soarer's converter firmware or similar). Should fit any non-Unicomp Model M if you remove the controller board and connect directly to the matrix with some FPC connectors and run Soarer's controller firmware or similar.

This mount will fit the Teensy 2.0/2.0++/3.0/etc, Arduino Pro Micro, and pretty much any ~20mm wide mini/micro USB project board. The Teensy/Arduino is simply slid into the mount and held in place with a bit of glue. The mount goes where the cable/socket originally was and is held in place with the stock mounts.