i half stripped a philip screw at the back of the cs carbon formula wheel

i half stripped one of the corner philip screws i am scared to tighten it any more. what can i do? do you know the size of this screw maybe i can replace it? thanks
i half stripped one of the corner philip screws i am scared to tighten it any more. what can i do? do you know the size of this screw maybe i can replace it? thanks