E3D dual height adjustable holder for K8400

When I changed my print extruder from default K8400 to E3D, I early realized that it was hard to realize dual printings when not both extruders were exactly adjusted on the same height. At this time, I didn't find any good solution for this problem here, so I started creating an own, adjustable E3D holder. After some steps of optimization, I finally got a nice version now that I want to share..

What you need beside the 5 printed parts:
Some M3 hexagon screws,
some M3 washer and nuts,
some