Does anyone know what this hole with the "x" beside it is on the bottom of my P3S controller is for?

Does anyone know what this hole with the "x" beside it is on the bottom of my P3S controller is for?
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Thanks too wonded what that wasIt has no function. This controller design was taken from the P2. When using that Phantom, you can use that hole to add a lever that tilts the gimbal.
Wasnt that hole used to adjust the ce fcc modes?
Isn't it the button to bind the controller to the phantom?
No -- there was never a bind button there.Isn't it the button to bind the controller to the phantom?
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