I combined two parts from the excellent Multifunction Arm mounting system Tablet Holder Hinge from DaHouzKat based off of the amazing Multifunction arm mounting system from RostaP so that the mount will no longer spin around.  This works well with my magnetic head where this spinning motion is no longer needed and can be a bit troublesome if the monitor's plate isn't dead center.  The hinge still can be adjusted from side to side and up and down but locks into that position.

All parts are included from the Original Hinge in an additional file for easy printing, I only merged 2 parts into one and removed the pin which is no longer required.