I don't have one to hand right now, but I literally just drill two holes in whatever I'm mounting to (either side of the Espruino board) and loop a cable tie around it.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
I don't have one to hand right now, but I literally just drill two holes in whatever I'm mounting to (either side of the Espruino board) and loop a cable tie around it.