How to build the extruder motor holder for the Kossel Mini I'm building a Kossel Mini, and I'm stuck on the extruder motor holder.

My Kossel came without instructions, I was given a set of instructions by a friend (the "Kossel Build Guide" by Blomker industries). I also found some instructions on the net. However, my components are different from  those in the build guides.

The question is how these components fit together.  

I'm pretty certain the stepper motor should be connected to the big black components (labeled (1) and (4) in the picture). The 4 holes in these components correspond to openings in the stepper motor; and the stepper motors for the vertical carriages, were connected in a similar way to their respective holders.

The round thing, second from the left on the bottom, (labeled (2) in the picture) presumably goes on the axis of the stepper motor. Once again, a similar procedure was needed for the motors that will move the vertical carriages.

The screws on the right, labeled (3), are 1&nbsp;cm long and 3&nbsp;mm wide.

The other screws are 2&nbsp;cm long and 3&nbsp;mm wide.

The stepper motor is a Wantai Stepper Motor Model 42BYGHW811 .

I have e-mailed the company where I bought my kit and am awaiting their answer. Meanwhile I'm hoping to get some advice here.

Apparently the usual stepper motor for a Kossel Mini is Nema 17. Searching  on "42BYGHW811" I mostly find datasheets. Using "Nema 17 mount" or "Nema 17 mounting screws" as search terms, I find a lot of images with a component like (1). But nothing on how this and the other components should be put together for the motor holder for an extruder for the Kossel Mini.
Have a look at the image provided in this seller's part description. it probably says more than my words could (which would also only rely on images - your parts just looked like I saw them somewhere before). 

3D printer parts right hand Bowden Extruder kit set no motor compact extruder aluminum alloy for