I am tryin to change the bottom end oil, i've never done this before but i watched a friend do it on his. Though on mine all i could find is the vent screw, but i cant find the bottom hole where the oil goes in, and 2, i cant c where the oil would come out once it is full.. Can anyone help me if you could, just bought the boat and was gonna take it out this weekend but would like to get this changed first, thanks