I am trying to change my lights from the blinding white lights to the "warm" light on my aquascape lighting and pond transformer with photocell (99070). EZ PZ I was told. Somehow I doubted that. I understand what needs to happen, but I CANNOT twist off the external casing! Is there a special crank to give me leverage? I am assuming the outside casing slides to the right or left, but can get no movement whatsoever. (And this has only been on my pond for a month). Can anyone tell me what I need to do to make this happen? Hire a pro wrestler??