Prusa i3 z-height regulator

Fine tune the initial z-height of your Prusa i3 easily by means of a screwdriver.
The endstop clamp is needed:
http://www.thingiverse.com/thing:71488
More information (in spanish):
http://www.iearobotics.com/wiki/index.php?title=Regulador_altura_Prusa_i3