This adds an ON / OFF function to a momentary tactile switch.

....was cleaning up after hacking a micro switch, and saw a bunch of useless little momentary button switches some crazy person salvaged for unknown reasons.
http://www.thingiverse.com/thing:765236

Designed in SAE (inches).
If your metric software detects impossibly tiny files, scale up (X,Y and Z) by a factor of 25.4