I don't have a cam with that specific mount but it seems many are similar in the way they tighten against the ball/swivel when the ring is rotated clockwise. Not sure about yours, but if you unscrew the tightening ring completely from the base and lift it up and away, could you place either a small flat washer or a small nut below the ball then re-assemble? The idea would be for the washer or nut to apply more material (and therefore friction) to the ball, compensating for wear.
Not saying this is the case but in the future it seems if the ring was unscrewed a bit MORE before trying to move and aim the camera then tightening it up there would not be so much wear on the ball, causing it to lose material and becoming smaller which keeps it from being tightened.