I remixed the Cap-RMS from SimenZhor. I printed his nice camera adapter, but had to find out that my lenses have a smaller thread.

It is an adapter for microscope lenses. From M15x0.6 (?) to RMS W 0,8" × 1/36".
I am not shure what exactly it should be for a thread, because M15x0.6 does not exist, but it is close enough, that it works. 

The hole in the middle is for a 10 mm allen key, to be able to screw it in. I used some silicon oil to reduce friction, because it was a tight fit between the two printed parts.