I am replacing the bulb in my pool spa. There was a small amount of water in the fixture. After it dried out I tested the fixture and it showed 120V. I tested a new bulb in a house lamp. When I put the bulb in the spa fixture it does not light. Removed bulb and test 120V again, everything okay. There is a spring in the fixture embedded in the epoxy which is in the way of the bulb. A second spring is attached to the first forming a cross. Can someone explain what the spring is for?