Belt Tensioner for Hesine Prusa i3 and others (Y-Axis)

My Y axis belt was kinda loose and it is a pain to get perfectly tight so I remixed this one for the Ultimaker for the Hesine Prusa i3,

For the i3 - Push the print bed all the way to the endstop, on the bottom belt, put this on the end opposite of the endstop almost touching the plastic.