Adjustable Hall sensor Z endstop for GRABER i3

to make this Z endstop, you need :
1.a 3144 Hall sensor module
2.a 10mm diameter 3mm heigh cylinder magnet
3. 7 M3 nuts and 4 short M3 screws(about 10mm) and 1 long M3 screw(about 35mm)
4.a short spring(about 15mm)