Does anyone know how to change the angle on the anode? My anode is only a couple months old so I know its not rusted on. I need to change the angle to trim my steering but the thing won't budge went i put vise grips on it. I read in other posts about some vent covers that hide a bolt that you turn to change the angle but it was unclear if this was for my engine or not. If so, where is this vent cover? Many Thanks!