Levelling screw for 40mm aluminium extrusion

A simple levelling screw that can be mounted on a 40mm (or bigger) aluminium extrusion. Personally, I'm using it for a large laser cutter/engraver, but it should be useful for many projects. Print three sets and you are set ;)
Now with a shoe: print it withe flexible filament and it will stop the machine from sliding around.