I don't think it looks that bad. As long as the divot for the ball is intact the pressure from the spring holding the fork down will keep the ball from coming out. Here's mine, in good shape. Though yours is chipped around the edges it looks like the divot itself (I don't know what you'd call it formally, looks like a divot on the green to me) seems to be okay. Just add a bit of grease to the ball to hold it in place while you reassemble and to lube it afterwards and it should be okay I'd think.