Ender 2 leveling knobs (front and back)

Print two for the front and one for the back.
The one for the back need to mount upwards and take care the endstop/case is not hit, even when you turn the knob. If you do not care, the printer can hit the knob when traveling to the home position and ruin your fine bed leveling adjustments. So take care nothing is hit the knob. If so, use a knife or sandpaper to remove sharp edges or other things who hit the case/endstop.