Anyone have any experience removing the Zinc from this unit. I've been able to unscrew the retaining screw but can't pull the zinc out. The zinc is pressed into the prop collar and should pull straight out. Can't get a good grip on it due to the diameter of the bow thruster tunnel. I've tried channel locks and vise grips but don't have enough room due to diameter in the tunnel to use these and grab what is left of the zinc.