Summary

Just a simple bracket to hold the common flip-type power switch.

Instructions

Print a bracket (if you want it for other side - don't forget to mirror it).
Print one or two of Circuitboard_bracket_m3_diag standard Mendel part: http://reprap.org/wiki/File:Circuitboard_bracket_m3_diag.png
I decided to use it because I already had some spare parts.

Take a switch (I took mine from my broken table lamp), put it into a hole and glue it. I used the glue gun to do this.

Hang the bracket on the sloped threaded rod (see picture).
Fix the bracket using the Circuitboard_bracket, M3 bolts, washers and nuts.
If you want to hold the power cable (I recommend to do so), put another one Circuitboard_bracket on the front side and squeeze the cable between brackets. Tighten the bolts.

Connect power cables to the switch.

Enjoy.

Power switch bracket for Mendel