Further to:
http://forum.arduino.cc/index.php?topic=445951.msg3115248#msg3115248
And
http://forum.arduino.cc/index.php?topic=445951.msg3109398#msg3109398
Small PCBs can be a challenge to mount in a project case.
This is especially true if the are no mounting holes in the PCB.
Below shows one way to attach an Arduino Pro Mini to the top of a case.
Note: no holes are made in the project case.
If the Pro Mini fails, just throw the assembly away with the Pro mini.
.