You know the spring on my new joystick and other like it.
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I think it's just for show, as it doesn't look as though this spring even serves purpose as the stick moves independently of it.
The springs aren't for show on those sticks. They provide tension as you push the stick to the edges. As you push the stick a plate must rise up at the bottom of the stick as it slides along the outer wall of the sticks base. That plate pushes against the spring creating the resistance that grows stronger the further from the centre the stick goes.