LPG gas pumps in Israel has this annoying button that you have to keep pressed while the pump is in operation. I made this because I'm too lazy to just stand with my arm raised.
Oh, and I enjoy the looks from other drivers filling their car saying :"how the **** does he do that??"

Print with 10% infill. no support needed at all, as long as you align the holder with the flat surface downwards.

Then use 14 6*6mm round magnets and glue them in the holes.
use any rubber band as the picture shows.
enjoy!