Had to use a hydraulic press to get mine out - it was seriously stuck and using a bigger hammer would just have damaged the assembly. Luckily I had access to one at work.
The pin (14) should be a press fit into bracket 4 so there is no movement between them, and the arm (12) moves on the pin. What happens is that the pin rusts solidly to the arm and the movement happens between the pin and bracket 4, buggering up the bracket.