Nema17 Mount for Kossel Mini

The first version (thing:371963) was perfectly working but had some cons. The most prominent is the fact that the screw that hold the extruder to the frame are also the screw constricting the ptfe nuts. This mean that when you remove the tube usually the extruder rest on the table next to the printer and unfortunately for calibration purpose I check the extruder feed rate when I change filament doing this a few time a day start to become really annoying.
Than this mount will change all this. T