You have to put the magnet across the posts of the metal u shaped iron magnet
The cup has to be taken out of the way for this process
I stacked those Amazon magnets on top each other until I had effectively a bigger magnet that the N and S poles could bridge the iron U
Rubbed it on there a bit like they show you to do in school when magnetizing nails
But I also left it on overnight for good measure
-s
