Button hook
No support needed
I hope you like it. I printed it out in matte black and advise you to do that too because it is beautiful.
Rubber band
You will need a rubber band that is 8 mm wide. It will be a tight fit but it works. It also works with a smaller width rubberband but it will be less clean.
How to mount
You can use a screw to mount it to the wall and glue the button and mount for a good permanent fit. They fit together without glue but there is a chance that it will fall off.
Credits:
Tomclo