I've got a couple of joysticks / game pads that have the same style of simple board inside:
When the stick is moved or the button is pressed, the thin metal "blister" is pressed onto the contact below.
However, sometimes, the contact only works when the stick or button is pressed super-hard, making it almost useless.
- It's not a wiring issue, and the blisters line-up correctly with the contacts underneath.
- This is for buttons on other controllers too, any ideas??