Lens adapter for Logitech C270

This is an adapter to use add-on lenses for the Logitech C270.
I use it with a fisheye lens (smartphone gadget) at my printer.
The design is for lenses with a 17mm thread - there is no thread in the model, cause the thread is too fine. I smoothly turned in the lens.
I used ASA,
Please have also a look to the mount bracket for the Logitech C270