another "Ender 2" z-axis correction spacer

Another small spacer for fixing the "Ender 2" z-axis problem
(when your z-axis is not moving up your brass-nut/extruder mount might not have a 90° angle to the tower / leadscrew)
just add it on top of the brass-nut

this worked fine for me , not saying this is gonna work for other ender2 printers, too.