I bought some 6mm neodymium magnets. There are two methods I've used.How do you attach those pads to the magnet please?
1. Make a ring out of a thick card material and glue the magnets on. When this is inserted into the pad it acts as a magnetic adapter. To get the magnet spacing right, you can lay the ring on top of the headphone cup and stick the magnets on, and trace them where they stick with a pencil. Glue them place.
2. The way I currentl have it is a bit lazier and bit less nice looking. the magnets are stuck onto the pads themselves by sticking a magnet both inside and outside the pad skirt at each magnet point. These magnets are stronger than the ones in the hp3 so they stay put when you remove the pads.